-17=8a+9a

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Solution for -17=8a+9a equation: 



-17=8a+9a

We move all terms to the left:

-17-(8a+9a)=0

We add all the numbers together, and all the variables

-(+17a)-17=0

We get rid of parentheses

-17a-17=0

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

-17a=17

a=17/-17

a=-1

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