Réponses

2014-09-15T19:50:41+02:00
a) -5(x+2)+3(x-3)=7
-5x-10+3x-9 = 7
-2x = 7 +10 +9
-2x = 26
x =26/-2
x = -13

c) 4(-x+1)-2(3x-5)=0
-4x+4-6x+10 =0
-10x +14 = 0
-10x = -14
x = -14/-10
x = 7/5

d) 7(2x-6)-4(5x-8)=-5x
14x -42 -20x +32 = -5x
14x+5x-20x = 42-32
-x = 10
x = -10