Réponses

2014-09-27T19:50:54+02:00
7.5+x = -12.5
x= -12.5 - 7.5
x=-20

10x=14
x=14/10
x=7/5

x/10=14
x=14*10=140

x-7.5=-12.5
x=-12.5+7.5
x=-5

3x+10=-8
3x=-8-10
3x=-18
x=-18/3
x=-6

7(2x-6) +5x = 4(5x-8)
14x-42+5x=20x-32
19x-42=20x-32
-42+32=20x-19x
-10=x
x=-10