-(a-9)=a+17

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Solution for -(a-9)=a+17 equation: 



-(a-9)=a+17

We move all terms to the left:

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

We get rid of parentheses

-a-a+9-17=0

We add all the numbers together, and all the variables

-2a-8=0

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

-2a=8

a=8/-2

a=-4

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