Salut !
si x=-3 alors 4x-5 = 4(-3)-5 = -12-5 = -17
si y = 4,5 alors 2(y+3) = 2(4,5+3) = 2(7,5) = 15
si x=-5 alors 2x²+3x-2 = 2(-5)²+3(-5)-2 = 50-15-2 = 33
5x-5-3x-6+4x = 6x-11
4y²+3y-6-2y²-y+5 = 2y²+2y-1
(6x-7)-(3-4x) = 6x-7-3+4x = 10x-10
(8x²+7x)+(-6+3x²)+(-6x-3) = 8x²+7x-6+3x²-6x+3 = 11x²+x-3