Respostas

2014-05-21T11:50:24-03:00
X/3-4 = -7  (faz o m.m.c entre (1,3) = 3
Assim fica:
x/3-12/3=-21/3
x-12=-21
x = -21+12
x = -9
2014-05-21T12:21:54-03:00