Respostas

2014-07-28T18:08:09-03:00
-2x+4x= 17-3
2x=14
x= 14/2
x=7
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2014-07-28T18:08:39-03:00
3-2x=17-4x
-2x+4x=17-3
2x=14
x=14/2
x=7
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