Respostas

2014-04-27T10:46:16-03:00
2014-04-27T10:50:49-03:00
X/4 + x/3 = 7 o mmc=12
então fica 3x/12 + 4x/12 = 84/12 se corta as bases
Sobra 3x+4x=84
7x=84
X =84/7
X= 12