Réponses

2014-02-20T14:39:18+01:00
X+x+3+x+6 = 36
x+x+x+3+6 = 36
3x + 9 = 36
3x + 9 - 9 = 36 - 9
3x = 27
x = 27/3
x = 9
2014-02-20T15:20:31+01:00