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A melhor resposta!
2014-08-23T14:03:26-03:00
12+(3x+6).(-7)-5=70
12-21x-42-5=70
-35-21x=70
-35-70=21x
-105=21x
x=-5
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2014-08-23T14:11:53-03:00
12+(3x+6).(-7)-5=7012-21x-42-5=70-35-21x=70-35-70=21x-105=21xx=-5 esta e a resposta serta 

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