SVP aider moi je comprend pas

4-3(5-2x) = 13 - 2x
4-15 + 6x = 13 - 2x
6x + 2x = 13 + 15 - 4
8x = 24
x = 24/8
x = 3
77
S ={3}


b) (x-5)(x+1) = 0
x - 5 = 0. ou. x +1 = 0
x = 5. x = -1

S = {-1;5}