a-15=13-3a

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Solution for a-15=13-3a equation: 



a-15=13-3a

We move all terms to the left:

a-15-(13-3a)=0

We add all the numbers together, and all the variables

a-(-3a+13)-15=0

We get rid of parentheses

a+3a-13-15=0

We add all the numbers together, and all the variables

4a-28=0

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

4a=28

a=28/4

a=7

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