Réponses

2014-01-26T15:44:17+01:00
Bonjour

x/6+ 7=5
Tu mets tout sous 6
x/6 + 42/6 = 30/6
x = 30 -42
x = - 12

-7x/8-12=-33
-7x - 96 = - 264
-7x = -264 +96
-7x = - 168
x =  24

20x-42=-82
20x = -82 +42
20 x = - 40
x = -2

-x/5+9=-11
-x + 45 = - 55
-x = -55 -45
-x = -100
x = 100

2x/3+37=57

2x + 111 = 171
2x = 171 - 111
2x = 60
x = 30