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2014-05-15T16:43:03-03:00
A) 3-2x-6=x-18
2x-x=-18+6-3
x= -15

b) 3x-12 = -3x+1
3x+3x=1+12
6x=13
x=13/6

c)5x/5 -5 = x-12x/3 -24
(simplifica o 5) x-5 = x- (simplifica o 12 com 3) 4x - 24
x-x+4x=-24+5
4x=-19
x=-19/4
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