17=8-9a

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Solution for 17=8-9a equation: 



17=8-9a

We move all terms to the left:

17-(8-9a)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

9a-8+17=0

We add all the numbers together, and all the variables

9a+9=0

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

9a=-9

a=-9/9

a=-1

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