Respostas

2014-07-27T22:27:39-03:00
X - 3/4 = x/5..........................
A melhor resposta!
2014-07-27T22:29:30-03:00
X-3/4=x/5
x-3/20=x/20
5x-15=4x
5x-4x=15
x=15
1 5 1