Réponses

2014-04-02T23:11:51+02:00
7x - 2 = 5 - x
7x + x - 2 = 5 - x + x
8x - 2 + 2 = 5 + 2
8x = 7
x = 7/8
x = 0,875
2014-04-02T23:14:54+02:00
7x-2 = 5-x
7x-2+x = 5-x+x
8x-2=5
8x-2+2=5+2
8x=7
8x/8=7/8
x=7/8