Respostas

2014-08-25T15:59:36-03:00
27=3.(x+3)

Organizando:

27=3x+9
3x=27-9
3x=18
x=18/3
x=6
2014-08-25T16:04:46-03:00
27 = 3x + 9
-3x = -27 +9
-3x = -18
****cancela o menos
x = 18/3 = 6
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