Respostas

2014-08-27T22:49:52-03:00
-6+9+(-3-8x)= -7(-3-8)
-6 +9 -3 -8x = 21 + 56
-8x = 21 + 56 + 6 - 9 + 3
-8x = 77 .(-1)
8x = -77
x=-77/8
x=-9,6