Resoudre les equations suivantes : 1) 2x +5 = -8 2) 7 x - 4= - 9x +8 3) 1 : 2 x + 3 : 4 = 3 : 8 - x 4) 3 (x - 5) = 2 x + 5 ( x - 1)

bonjour2 x

1) 2 x = - 8 -5
     2 x = - 13
     x = - 13/2

2) 7 x + 9 x = 8 + 4 
    16 x = 12
        x = 12/16
        x = 3/4

3) 1/2 x + 3/4 = 3/8  - x
    4 x + 6 = 3 - 8 x
   4 x + 8 x = 3 -6
  12 x = - 3
x =-3/12 = - 1/4

4) 3 x -15 = 2 x + 5 x - 5
    3 x - 2 x  - 5 x = - 5 +15
  - 4 x = 10
      x = - 10/4 = - 5/2