13=10+a

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Solution for 13=10+a equation: 



13=10+a

We move all terms to the left:

13-(10+a)=0

We add all the numbers together, and all the variables

-(a+10)+13=0

We get rid of parentheses

-a-10+13=0

We add all the numbers together, and all the variables

-1a+3=0

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

-a=-3

a=-3/-1

a=+3

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