` 5/8 -x = 7/6`

`=> x= 5/8 -7/6`

`=>x= 30/48 - 56/48`

`=>x=-26/48`

`=>x=-13/24`

__

`1/6 + 1/5 :x =-7 /18`

`=>  1/5 :x =-7 /18 -1/6`

`=>  1/5 :x =-7 /18- 3/18`

`=>  1/5 :x =-5/9`

`=>x= 1/5 : (-5/9)`

`=>x= 1/5 xx (-9/5)`

`=>x=-9/25`

a: x=5/8-7/6=15/24-28/24=-13/24

b: =>1/5:x=-7/18-1/6=-7/18-3/18=-10/18=-5/9

=>x=-1/5:5/9=-9/25

\(\dfrac{5}{8}-x=\dfrac{7}{6}\\ x=\dfrac{5}{8}-\dfrac{7}{6}\\ x=\dfrac{15}{24}-\dfrac{28}{24}\\ x=-\dfrac{7}{24}\)

\(\dfrac{1}{6}+\dfrac{1}{5}:x=-\dfrac{7}{18}\\ \dfrac{1}{5}:x=-\dfrac{7}{18}-\dfrac{1}{6}\\ \dfrac{1}{5}:x=-\dfrac{7}{18}-\dfrac{3}{18}\\ \dfrac{1}{5}:x=-\dfrac{5}{9}\\ x=\dfrac{1}{5}:\left(-\dfrac{5}{9}\right)\\ x=-\dfrac{9}{25}\)

1a) \(\frac{x-3}{x+7}=\frac{-5}{-6}\)

=> \(\frac{x-3}{x+7}=\frac{5}{6}\)

=> (x - 3).6 = 5.(x + 7)

=> 6x - 18 = 5x + 35

=> 6x - 5x = 35 + 18

=> x = 53

b) \(\frac{x-7}{x+3}=\frac{4}{3}\)

=> (x - 7). 3 = (x + 3). 4

=> 3x - 21 = 4x + 12

=> 3x - 4x = 12 + 21

=> -x = 33

=> x = -33

c) \(\frac{x-10}{6}=-\frac{5}{18}\)

=> (x - 10) . 18 = -5 . 6

=> 18x - 180 = -30

=> 18x = -30 + 180

=> 18x = 150

=> x = 150 : 18 = 25/3

d) \(\frac{x-2}{4}=\frac{25}{x-2}\)

=> (x - 2)(x - 2) = 25 . 4

=> (x - 2)² = 100

=> (x - 2)² = 10²

=> \(\orbr{\begin{cases}x-2=10\\x-2=-10\end{cases}}\)

=> \(\orbr{\begin{cases}x=12\\x=-8\end{cases}}\)

e) \(\frac{7}{x}=\frac{x}{28}\)

=> 7 . 28 = x . x

=> 196 = x²

=> x² = 14²

=> \(\orbr{\begin{cases}x=14\\x=-14\end{cases}}\)

f) \(\frac{40+x}{77-x}=\frac{6}{7}\)

=> (40 + x) . 7 = (77 - x).6

=> 280 + 7x = 462 - 6x

=> 280 - 462 = -6x + 7x

=> -182 = x

=> x = -182

36367 l'290209 92021

5.(x+7)=3.(2-x)

=>5x+35=6-3x

=>5x+3x=6+41

=>8x=47

=>x=47:8=47/8

\(12\left(x-3\right)=5\left(x-1\right)+4\)

\(\Rightarrow12x-36=5x-5+4\)

\(\Rightarrow12x-5x=-5+4+36\)

\(\Rightarrow7x=35\)

\(\Rightarrow x=5\)

\(-6\left(x-7\right)+2\left(x+10\right)=x-18\)

\(-6x+42+2x+20=x-18\)

\(-6x+2x-x=-18-20-42\)

\(-5x=-80\)

\(x=16\)

\(7\left(2x-1\right)-12\left(x-5\right)=3\)

\(\Rightarrow14x-7-12x+60=3\)

\(\Rightarrow14x-12x=3-60+7\)

\(\Rightarrow2x=-50\)

\(\Rightarrow x=-25\)

\(\left|2x-1\right|=17\)

\(\Leftrightarrow\orbr{\begin{cases}2x-1=17\\2x-1=-17\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=9\\x=-8\end{cases}}\)

\(\left|8-3x\right|=14\)

\(\Leftrightarrow\orbr{\begin{cases}8-3x=14\\8-3x=-14\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=-2\\x=\frac{22}{3}\end{cases}}\)

\(\frac{4}{3}+\frac{x}{3}\text{ × }7=6\)

\(\frac{x}{3}\text{ × }7=6-\frac{4}{3}\)

\(\frac{x}{3}=\frac{14}{3}:7\)

\(\frac{x}{3}=\frac{2}{3}\)

\(\Leftrightarrow x=2\)

Các phần còn lại bạn làm tương tự nha 

x-5/5=135/45

x-5/5=15/5

=>x-5=15

x=15+5

x=20

a, \(\frac{4}{3}+\frac{x}{3}.7=6=>\frac{7x}{3}=6-\frac{4}{3}=>x=2\)

Vậy x =2

b, \(\frac{5}{x-1}=\frac{15}{18}=>\frac{x-1}{\left(5.18\right):15}=>x-1=6=>x=7\)

Vậy x =7

c,\(x-\frac{5}{5}=\frac{135}{45}=>x-1=3=>x=4\)

Vậy x =4

Chúc bạn học tốt

1) (2 4/5+3 1/2).x =18/17

(14/5 + 7/2).x       = 18/17

(28/10 + 35/10). x = 18/17

63/10.x                 = 18/17

           x                = 18/17 : 63/10

           x                =...(cái này bạn tự tính nhé :v )

2)  Làm tương tự như phần 1

\(6\frac{1}{3}x-5\frac{1}{3}x=\frac{1}{7}\)

\(\Leftrightarrow\frac{19}{3}x-\frac{16}{3}x=\frac{1}{7}\)

\(\Leftrightarrow\frac{3}{3}x=\frac{1}{7}\)

\(\Leftrightarrow x=\frac{1}{7}\)

Vậy \(x=\frac{1}{7}\)

Mọi người tk mình đi mình đang bị âm nè!!!!!!

Ai tk mình mình tk lại nha !!!

a.1/4

b.-7/144

c.25/21

d.17/7

e.80/63

f.9/7

a)1/4

b)-7/144

c)-25/21

d)17/7

e)16/63

f)9/7