Respostas

2014-04-22T21:35:43-03:00
2x-4 = -x+5
2x = -x +5 +4
2x = -x +9
2x + x = 9
3x = 9
x = 9/3
x = 3

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1) x = 3
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1 5 1
2014-04-22T23:49:42-03:00
2x-4=-x+5
2x+x=5+4
3x=9
x=9/3
x=3
resposta 1