bonsoir aidez moi svp a 3(2x+7)-4=7-5(4-3x) b 2x(3x-4)+5=3x(2x-5)-4

a) 3 (2x + 7) - 4 = 7 - 5 (4 - 3x)
6x + 21 - 4 = 7 - 20 + 15x
6x - 15x = 7 - 20 - 21 + 4
- 9x = - 30
x = - 30 / (- 9)
x = 10/3

b) 2x (3x - 4) + 5 = 3x (2x - 5) - 4
6x² - 8x + 5 = 6x² - 15x - 4
6x² - 6x² - 8x + 15x = - 4 - 5
7x = - 9
x = - 9/7