3a-7(6a+3)=13-5a

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Solution for 3a-7(6a+3)=13-5a equation: 



3a-7(6a+3)=13-5a

We move all terms to the left:

3a-7(6a+3)-(13-5a)=0

We add all the numbers together, and all the variables

3a-7(6a+3)-(-5a+13)=0

We multiply parentheses

3a-42a-(-5a+13)-21=0

We get rid of parentheses

3a-42a+5a-13-21=0

We add all the numbers together, and all the variables

-34a-34=0

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

-34a=34

a=34/-34

a=-1

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