13=13+a

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Solution for 13=13+a equation: 



13=13+a

We move all terms to the left:

13-(13+a)=0

We add all the numbers together, and all the variables

-(a+13)+13=0

We get rid of parentheses

-a-13+13=0

We add all the numbers together, and all the variables

-a=0

a=0/-1

a=0

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