il faut trouver les solutions..
2(4x-5) = 4 + x
2*4x + 2*(-5) = 4 + x
8x - 10 = 4 + x
8x - x = 4 + 10
7x = 14
x = 14/7 = 2
2 (x+8) + 3 = 4 - 3x
2x + 16 + 3 = 4 - 3x
2x + 3x = 4 - 19
5x = - 15
x = -15/5 = -3
12x -1 = 2 (5x -2) + 1
12x - 1 = 10x - 4 + 3
12x - 10x = 0
x = 0
(x-3)² = x (x-5)
x² - 6x + 9 = x² - 5x
-6x + 5x = - 9
x = 9
