15=-7+a

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Solution for 15=-7+a equation: 



15=-7+a

We move all terms to the left:

15-(-7+a)=0

We add all the numbers together, and all the variables

-(a-7)+15=0

We get rid of parentheses

-a+7+15=0

We add all the numbers together, and all the variables

-1a+22=0

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

-a=-22

a=-22/-1

a=+22

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