a, \(\frac{x}{12}=-\frac{1}{24}-\frac{1}{8}\Leftrightarrow\frac{x}{12}=-\frac{1}{6}\Leftrightarrow6x=-12\Leftrightarrow x=-2\)

b, \(\frac{2}{3}x=\frac{1}{2}x+\frac{15}{12}\Leftrightarrow\frac{2x}{3}=\frac{x}{2}+\frac{15}{12}\Leftrightarrow\frac{4x}{6}-\frac{3x}{6}=\frac{15}{12}\Leftrightarrow\frac{x}{6}=\frac{15}{12}\Leftrightarrow x=\frac{15}{2}\)

c, \(\left|\frac{3}{4}-2x\right|+\frac{1}{6}=\frac{9}{2}\Leftrightarrow\left|\frac{3}{4}-2x\right|=\frac{13}{3}\)

\(\Leftrightarrow\orbr{\begin{cases}\frac{3}{4}-2x=\frac{13}{3}\\\frac{3}{4}-2x=-\frac{13}{3}\end{cases}\Leftrightarrow\orbr{\begin{cases}2x=-\frac{43}{12}\\2x=\frac{61}{12}\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=-\frac{43}{24}\\x=\frac{61}{24}\end{cases}}}\)

a) x-12=-9+15

     x-12=24

     x=24+12

     x=36

Vậy x=36

b)4x -12=400

    4x=412

    x=412:4

   x=103

Vậy x=103

c)2x -35=15

   2x=50

   x=50:2

   x=15

Vậy x=15

d)3x+17=2

   3x=-15

   x=(-15):3

  x=-5

Vậy x=-5

e)\(\frac{-5}{8}=\frac{x}{16}\)

\(\Rightarrow\left(-5\right).16=8.x\)

\(\Rightarrow8x=-80\)

\(\Rightarrow x=-10\)

f)\(\frac{y}{10}=-\frac{4}{8}\)

\(\Rightarrow8y=\left(-4\right).10\)

\(\Rightarrow8y=-40\)

\(\Rightarrow y=-5\)

a) x - 12 = -9 + 15 

=> x - 12 = 6 

=> x = 6 + 12 = 18

b) 4x - 12 = 400 

=> 4x = 400 + 12 = 412

=> x = 412 : 4 = 103

c) 2x - 35 = 15

=> 2x = 15 + 35 = 50

=> x = 50 : 2 = 25

d) 3x + 17 = 2

=> 3x = 2 - 17 

=> 3x = -15

=> x = -15 : 3 = -5

e) \(\frac{-5}{8}=\frac{x}{16}\)

\(=>\frac{-10}{16}=\frac{x}{16}\)

=> x = -10

f) \(\frac{y}{10}=\frac{-4}{8}\)

\(=>\frac{y}{10}=\frac{-1}{2}\)

\(=>\frac{y}{10}=\frac{-5}{10}\)

=> y = -5

a) x - 12 = -9 + 15

x - 12 = 6

x = 12 + 6

x = 18

b) 4x - 12 = 400

4x = 412 

x = 412 : 4

x = 103

c) 2x - 35 = 15

2x = 50

=> x = 25 

d) 3x + 17 = 2

=> 3x = -15

=> x = -5

e) -5/8 = x/16

=> -10/16 = x/16

=> x = -10

y/10 = -4/8

=> y/10 = -40/80

=> y/10 = -5/10

=> y = -5

A. \(4\left(x+2\right)-7\left(2x-1\right)+9\left(3x-4\right)=30\)
\(\Leftrightarrow4x+8-14x+7+27x-36=30\)
\(\Leftrightarrow4x-14x+27x=30-8-7+36\)
\(\Leftrightarrow17x=51\)
\(\Leftrightarrow x=3\) . Vậy \(S=\left\{3\right\}\)

B. \(2\left(5x-8\right)-3\left(4x-5\right)=4\left(3x-4\right)+11\)
\(\Leftrightarrow10x-16-12x+15=12x-16+11\)
\(\Leftrightarrow10x-12x-12x=16-15-16+11\)
\(\Leftrightarrow10x=-4\)
\(\Leftrightarrow x=-\dfrac{2}{5}\) . Vậy \(S=\left\{-\dfrac{2}{5}\right\}\)

Câu C) bạn xem lại đề nha mik tính ko đc

D. \(\left(5x-3\right)4x-2x\left(10x-3\right)=15\)
\(\Leftrightarrow20x^2-12x-20x^2+6x=15\)
\(\Leftrightarrow-6x=15\)
\(\Leftrightarrow x=-\dfrac{5}{2}\) . Vậy \(S=\left\{-\dfrac{5}{2}\right\}\)

a) ( 5x - 4)(4x + 6)=0

<=> \([^{5x-4=0}_{4x+6=0}< =>[^{x=\frac{4}{5}}_{x=\frac{-6}{4}}\)

Vậy S = \(\left\{\frac{4}{5};\frac{-6}{4}\right\}\)

b) ( 3,5x - 7 )( 2,1x - 6,3 ) = 0

<=> \([^{3,5x-7=0}_{2,1x-6,3=0}< =>[^{x=2}_{x=3}\)

Vậy S = \(\left\{2;3\right\}\)

c) ( 4x - 10 )( 24 + 5x ) = 0

<=> \([^{4x-10=0}_{24+5x=0}< =>[^{x=\frac{5}{2}}_{x=\frac{-24}{5}}\)

Vậy S = \(\left\{\frac{5}{2};\frac{-24}{5}\right\}\)

d) ( x - 3 )( 2x + 1 ) = 0

<=> \(\left[{}\begin{matrix}x-3=0\\2x+1=0\end{matrix}\right.< =>\left[{}\begin{matrix}x=3\\x=\frac{-1}{2}\end{matrix}\right.\)

Vậy S = \(\left\{3;\frac{-1}{2}\right\}\)

e) ( 5x - 10 )( 8 - 2x ) = 0

<=> \(\left[{}\begin{matrix}5x-10=0\\8-2x=0\end{matrix}\right.< =>\left[{}\begin{matrix}x=2\\x=4\end{matrix}\right.\)

Vậy S = \(\left\{2;4\right\}\)

f) ( 9 - 3x )( 15 + 3x ) = 0

<=> \(\left[{}\begin{matrix}9-3x=0\\15+3x=0\end{matrix}\right.< =>\left[{}\begin{matrix}x=3\\x=-5\end{matrix}\right.\)

Vậy S = \(\left\{3;-5\right\}\)

Học tốt nhaaa !

15 - 3 . (-6) - 2x = 4 . (-2) + 3x - 3²

<=> 15 + 18 - 2x = -8 + 3x - 9

<=> -2x - 3x = -15 - 18 - 8 - 9

<=> - 5x = -50

<=> x = 10

Vậy ...

b ) - 8 + 30(x+2)-6(x-5)-24 = 10

<=> - 8 + 30x + 60 - 6x + 30 - 24 = 10

<=> 30x - 6x = 8 - 60 - 30 + 24 + 10

<=> 24x = -48

<=> x = - 2

Vậy ...

Noob ơi, bạn phải đưa vào máy tính ý solve cái là ra x luôn, chỉ tội là đợi hơi lâu

a, 4.(18 - 5x) - 12(3x - 7) = 15(2x - 16) - 6(x + 14) 

=> 72 - 20x - 36x + 84 = 30x - 240 - 6x - 84

=> (72 + 84) + (-20x - 36x) = (30x - 6x) + (-240 - 84) 

=> 156 -  56x = 24x - 324 

=>  24x + 56x = 324 + 156 

=> 80x = 480 

=> x = 480 : 80 =  6 

Vậy x = 6 

b, 5(3x + 5) - 4(2x - 3) = 5x + 3(2x + 12) + 1 

=> 15x + 25 - 8x + 12 = 5x + 6x + 36 + 1 

=> (15x - 8x) + (25 + 12) = 11x + 37 

=> 7x + 37 = 11x + 37 

=> 11x - 7x = 0 

=>  x = 0 

a:x=3/5-7/8=24/40-35/40=-11/40

b: =>1/3:(2x-1)=-1/6

=>2x-1=-2

=>2x=-1

=>x=-1/2

c: =>x-3/4=17/2+7/4=34/4+7/4=41/4

=>x=11

d: =>3x+2=0 hoặc 2/5x+7=0

=>x=-2/3 hoặc x=-7:2/5=-35/2