15=13+a

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Solution for 15=13+a equation: 



15=13+a

We move all terms to the left:

15-(13+a)=0

We add all the numbers together, and all the variables

-(a+13)+15=0

We get rid of parentheses

-a-13+15=0

We add all the numbers together, and all the variables

-1a+2=0

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

-a=-2

a=-2/-1

a=+2

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