13=5a+8a

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Solution for 13=5a+8a equation: 



13=5a+8a

We move all terms to the left:

13-(5a+8a)=0

We add all the numbers together, and all the variables

-(+13a)+13=0

We get rid of parentheses

-13a+13=0

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

-13a=-13

a=-13/-13

a=1

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