-9=8+a

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Solution for -9=8+a equation: 



-9=8+a

We move all terms to the left:

-9-(8+a)=0

We add all the numbers together, and all the variables

-(a+8)-9=0

We get rid of parentheses

-a-8-9=0

We add all the numbers together, and all the variables

-1a-17=0

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

-a=17

a=17/-1

a=-17

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