Resoudre chaque équation. a) 2(3x +5)=8-x b) (5x+7)(12-3x)=0

a / 2(3x+5)=8-x
= 6x +10 =8-x
= 6x -x =8-10
5x. = -2
X = -2/5
B/ (5x+7)(12-3x)=0
(5x+7)=0. Or (12-3x)=0
X = -7/5 or -3x = -12
Or -x = -12/3
X= 12/3