Respostas

2014-07-24T19:18:37-03:00
Subtract both sides by 7 to get: 

7 - 7 - 3x = 40 - 7 
-3x = 33 

Finally, divide both sides by -3 to get: 

-3x/-3 = 33/-3 

So x = -11 
 
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