Respostas

2013-10-30T11:20:19-02:00
2(x+1)-(x-1)=0
2x+2-x+1=0
x+3=0
x=-3
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2013-10-30T11:26:39-02:00
-- 2(x+1)-(x-1)=0
2x+2-x+1 = 0
2x-x = -2-1
x = -3
1 5 1