13=a+8

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Solution for 13=a+8 equation: 



13=a+8

We move all terms to the left:

13-(a+8)=0

We get rid of parentheses

-a-8+13=0

We add all the numbers together, and all the variables

-1a+5=0

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

-a=-5

a=-5/-1

a=+5

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