Respostas

2014-04-24T09:39:38-03:00
 \frac{x}{4}+ \frac{x}{7}=2
MMC: 7,4 -> 7*4 = 28
 \frac{7x}{28} + \frac{4x}{28}= \frac{56}{28}
 \frac{11x}{28}= \frac{56}{28}
11x=56 -> x= \frac{56}{11}
Logo, resposta =  \frac{56}{11}