Respostas

2013-11-22T00:13:19-02:00
5(3-x)=2(x-4)+15 
15 - 5x = 2x -8 + 15
15 -5x -2x = 7
15 -7x = 7
-7x = 7 - 15
-7x = -8 .(-1)
7x = 8
x = 8/7
2013-11-22T00:15:09-02:00
5(3-x)=2(x-4)+15
15 - 5x = 2x - 8 + 15
-5x - 2x = -8 + 15 - 15
-7x = -8 multiplique por (-1)
7x = 8
x = 8/7


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