Respostas

2014-02-24T17:39:35-03:00
X +  \frac{x}{3} = 2x-25
x +  \frac{x}{3}  - \frac{x}{3}  -2x = 2x -2x -25 - \frac{x}{3}  
x -2x = -25 - \frac{x}{3}  
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