Réponses

2013-04-07T12:03:59+02:00

9 - 3 (5 +2x) = 4 + 8 (1 -3x)

9 -15 -6x = 4 +8 -24x

6 -6x = 12 -24x

-6x +24x = -6 +12

+18x = +6

x = 6/18

x = 1/3