15=-(m+-9)

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Solution for 15=-(m+-9) equation: 



15=-(m+-9)

We move all terms to the left:

15-(-(m+-9))=0

We add all the numbers together, and all the variables

-(-(m-9))+15=0



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

-(m-9)

We get rid of parentheses

-m+9

We add all the numbers together, and all the variables

-1m+9

Back to the equation:

-(-1m+9)



We get rid of parentheses

1m-9+15=0

We add all the numbers together, and all the variables

m+6=0

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

m=-6

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