Réponse:

a) 1/2x + 2 = -3/2x +8

1/2x +3/2x = 8-2

4/2x = 6

2x = 6

2x/2 = 6/2

x = 3

b) 3(x + 2/9) = -2/3

3x + 6/9 = -2/3

3x = -2/3 -6/9

3x = -2/3 -2/3

3x = -4/3

3x × 1/3 = -4/3 × 1/3

x = -4/9

c) 5(x+4) = 3(x+5)

5x +20 = 3x + 15

5x -3x = 15 -20

2x = -5

2x/2 = -5/2

x = -5/2

d) x -6(2-x) = -48

x -12 +6x = -48

x +6x = -48 +12

7x = -36

7x/7 = -36/7

x = -36/7