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A melhor resposta!
2014-08-07T11:01:17-03:00
E facil...
x+5+x+4+7=172
x+x=172-5-4-7
2x=156
x=156/2
x=78
3 4 3
2014-08-07T11:01:43-03:00
5x+7(x+4)=172
5x+7x+28=172
12x=144
X=12
1 2 1