17=a-(-9)

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



17=a-(-9)

We move all terms to the left:

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



We calculate terms in parentheses: -(a-(-9)), so:

a-(-9)

We add all the numbers together, and all the variables

a+9

Back to the equation:

-(a+9)



We get rid of parentheses

-a-9+17=0

We add all the numbers together, and all the variables

-1a+8=0

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

-a=-8

a=-8/-1

a=+8

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