0=a-(-9)

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Solution for 0=a-(-9) equation: 



0=a-(-9)

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(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=0

We add all the numbers together, and all the variables

-1a-9=0

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

-a=9

a=9/-1

a=-9

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