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2013-11-27T14:34:17-02:00
5x-40=2-x
5x+x=40+2
6x=42
x=42/6
x=7
1 5 1
2013-11-27T14:35:01-02:00
5x-40=2-x
5x+x=2+40
6x=42
x= \frac{42}{6}

x=7
1 3 1