25=13+a

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Solution for 25=13+a equation: 



25=13+a

We move all terms to the left:

25-(13+a)=0

We add all the numbers together, and all the variables

-(a+13)+25=0

We get rid of parentheses

-a-13+25=0

We add all the numbers together, and all the variables

-1a+12=0

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

-a=-12

a=-12/-1

a=+12

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