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a)7-3x=28

     3x =7-28

     3x =-21

      x  =-21:3

      x  =-7

b)12-x=13-(-4)

    12-x=13+4

    12-x=17

         x=12-17

         x=-5

c)15-2(x-1)=-3

         2(x-1) =15+3

         2(x-1) =18

          x-1    =18:2

          x       =9+1

          x       =10

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

   2x-(3+x)=-2

        3+x  =2x+2

        3+x-2  =2x

        x+1  =2x

    x+1  =x+x

   =>x=1

    #Chúc bạn học tốt#

     k cho mk nha ,please!!!

a) 7 - 3x = 28

3x = 7 - 28 

3x = -21

x = -21 : 3 

x = -7

vậy x = -7

b) 12 - x = 13 -(-4)

12 - x = 17

x = 12 - 17

x = -5

vậy x = -5

c) 15 - 2 . (x - 1) = -3

2 . (x - 1) = 15 -(-3) 

2 . (x - 1) = 18

x - 1 = 18 : 2

x - 1 = 9

x = 9 + 1 

x = 10

vậy x = 10

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

2x - (3 + x) = -2

3 + x = 2x -(-2)

3 + x - 2 = 2x

x + 1 = 2x

x + 1 = x + x

=> x = 1

vậy x = 1

k cho mk nha

a) 1/2x - 2/3x = 7/12

    -1/6x = 7/12

     x = \(\frac{7}{12}\div\frac{-1}{6}\)

     x = -7/2

b)  x: 12 = -2,5

     x = -2,5*12

     x = -30

c) 11/2x = 13/15

    x = 13/15:11/2

    x = 26/165

d) 3x/7 + 1 = (-1/28)*(-4)

    3x/7 + 1 = 1/7

    3x/7 = 1/7 - 1

    3x/7 = -6/7

    3x = -6

    x= -6/3

    x= -2

a) x(0.5 - 2/3 ) = 7/12

        (-1/6)x = 7/12

             x      = 7/12 : (-1/6)

            x      =-7/2

b) x :  12 = -2,5

   x= -2.5 * 12  =-30

c)   x = 13/15 : 5,5

    x  =26/125

d) 3x/7 + 1  =  -1/28 * (-4)

   3x/7 + 1   =1/7

  3x/7    = 1/7 -1

   3x/7  =-6/7

   3x    =-6/7 * 7 

  3x = -6

   x =-2

hsssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss

a,  \(0,5x-\frac{2}{3}x=\frac{7}{12}\)

=> \(x\left(0,5-\frac{2}{3}\right)=\frac{7}{12}\)

=>\(\frac{-1}{6}x=\frac{7}{12}\)=> \(x=\frac{7}{12}:\frac{-1}{6}=\frac{-7}{2}\)

b,  \(x:\frac{13}{3}=-2,5\)

=>\(x=\left(-2,5\right):\frac{13}{3}=\frac{-7,5}{13}\)

c,   \(5,5x=\frac{13}{15}\)

=>\(x=\frac{13}{15}:5,5=\frac{13}{82,5}\)

d,  \(\left(\frac{3x}{7}+1\right):\left(-4\right)=\frac{-1}{28}\)

=>\(\left(\frac{3x}{7}+1\right)=\frac{-1}{28}:\left(-4\right)=\frac{1}{7}\)

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

=>\(3x=-6\)

=> \(x=\left(-6\right):3=-3\)

a: =>1/2x-2/3x=7/12

=>-1/6x=7/12

hay x=-7/2

b: \(\Leftrightarrow x=-\dfrac{5}{2}\cdot\dfrac{13}{3}=\dfrac{-65}{6}\)

c: =>x=13/15:11/2=26/165

d: =>3/7x+1=1/7

=>3/7x=-6/7

hay x=-2

0,5x-2/3x=7/12

=>(1/2-2/3).x=7/12

=>-1/6x=7/12

=>x=7/12:1/6

=>x=7/2

b, x:4 1/3=-2,5

=>x:13/3=-2,5

=>x=-5/2x13/3

=>x=-13

c,5,5x=13/15

=>11/2x=13/15

=>x=13/15:11/2

=>x=26/165

d,(3x/7+1):-4=-1/28

=>3x/7+1=-1/28x(-4)

=>3x/7+1=-1/7

=>3x/7=-1/7-1

=>3x/7=-8/7

=>3x=-8/7x7

=>3x=8

=>x=8:3

=>x=8/3

\(0,5x-\frac{2}{3}x=\frac{7}{12}\)

\(\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)

\(\left(\frac{1}{2}-\frac{2}{3}\right)x=\frac{7}{12}\)

\(\frac{-1}{6}x=\frac{7}{12}\)

\(x=-21\)

b,c,d tương tự

câu trả lời b kết qua bằng -65/6