-15=-8+a

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Solution for -15=-8+a equation: 



-15=-8+a

We move all terms to the left:

-15-(-8+a)=0

We add all the numbers together, and all the variables

-(a-8)-15=0

We get rid of parentheses

-a+8-15=0

We add all the numbers together, and all the variables

-1a-7=0

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

-a=7

a=7/-1

a=-7

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