Réponse:
Bonjour ;),
a. 5x-6=9x-11
5x-6+6=9x-11+6
5x-9x= 9x-9x-5
-4x = -5
-4x/-4= -5/-4
x= 1,25
b. 5+6(3+7x) = 2(3x-7)-10
11×3+11×7x= 2×3x-2×(-7)-10
33+77x = 6x+14-10
33-33+77x= 6x+4-33
77x-6x = 6x-6x-29
71x = -29
71x/71 = -29/71
x = -0,40
c. (4x - 5)(4x+5) = (2x - 3)(x+7)
8x = 3x+4
8x -3x = 3x-3x+4
5x = 4
5x/5 = 4/5
x = 0,8
d.10x -5= 12+5 (2x+3)
10x-5=17×2x+17×3
10x -5+5=44x+51+5
10x-44x = 44x-44x +56
-34x = 56
-34x/-34= 56/-34
x= -1,64
Voilà je pense que c'est ça
