Bonsoir,
Résoudre l'équation :
(5x+2)(6x-5)-(5x+2)(7x-4) = 0
(5x+2)(6x-5-(7x-4)) = 0
(5x+2)(6x-5-7x+4) = 0
(5x+2)(-x-5+4) = 0
(5x+2)(-x-1) = 0
5x+2 = 0 ; -x-1 = 0
x = -2/5 ; x = -1
S = {-2/5 ; -1}
Bonne soirée.