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

-(-1a+8)+15=0

We get rid of parentheses

1a-8+15=0

We add all the numbers together, and all the variables

a+7=0

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

a=-7

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