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2014-04-02T21:15:08+02:00
A  x= 2
b  x =1
c  m  =- 1/3
d  y = 4
e  x = 9
f  -9/2 = a
g  m = 5/6

Meilleure réponse !
2014-04-02T21:16:37+02:00

1 ) 2x + 5 = 15 -3x

2x +3x = 15-5

5x        = 10

   x       = 10/5

   x        = 2

2) -6x +4 = -1-x

    -6x +x   = -4 -1

         -5x   =  -5

           x      = -5/(-5)

            x      = 1

3) 7m +10 = m-8

     7m -m  = -10 -8

          6m  = -18

            m =     -18/6

            m =  - 3

4) -12y = 4 -13y

   -12y +13y = 4

             1y   = 4

               y = 4

5) 4x = 36

     x = 34/4

      x= 9

6) 18 = -4a

    18/(-4) = a

     a = -4.5

7 ) 4/5m = 2/3

         m =  2/3  /  4/5

         m =   2/3 x 5/4  

        m   =  10 / 12

        m =  5/6