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
