Respostas

2014-03-24T20:10:06-03:00
A)5x-5=8x+2
5x-8x=2+5
-3x=7 (-1)
3x=-7
x=-7/3


B)3(t-5)+7t=5(3-t)
3t-15+7t=15-5t
3t+7t+5t=15+15
15t=30
t=30/15
t=2
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