Respostas

2013-09-19T17:15:59-03:00
15=-3X
3x = -15
x = -15/3
x = -5

-5X=15
-15 = 5x
x = -15/5
x = -3

9X+9+3X=15
9x+3x = 15-9
12x = 6
x = 6/12
x = 1/2
2 3 2