Respostas

2014-07-13T22:19:26-03:00
7+2x-2=x
5=-x
x=-5

6+3x-3=2x
3=-x
x=-3

15+3x+6=-7x+2x+2
21+3x=-5x+2
19+8x=0
8x=-19
x=-2,375



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