Respostas

2014-05-01T08:22:26-03:00
2014-05-01T08:22:30-03:00
 + x = 7
4     3              

Tire o MMC entre 3 e 4 que dará 12
3x + 4x = 84
7x = 84
x = 84/7
x = 12 
1 5 1