Respostas

2014-04-10T17:18:38-03:00
5x+4.7=172
5x+28=172
5x=172-28
5x=144
x=144/5
x=28,80
18 2 18
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2014-04-10T17:19:34-03:00
5x+7(x+4)=172
5x+7x=172-28
x= \frac{144}{12}
x=12
21 4 21