39=6x+7x

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Solution for 39=6x+7x equation: 



39=6x+7x

We move all terms to the left:

39-(6x+7x)=0

We add all the numbers together, and all the variables

-(+13x)+39=0

We get rid of parentheses

-13x+39=0

We move all terms containing x to the left, all other terms to the right

-13x=-39

x=-39/-13

x=+3

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