81=f-(-9)

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Solution for 81=f-(-9) equation: 



81=f-(-9)

We move all terms to the left:

81-(f-(-9))=0



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

f-(-9)

We add all the numbers together, and all the variables

f+9

Back to the equation:

-(f+9)



We get rid of parentheses

-f-9+81=0

We add all the numbers together, and all the variables

-1f+72=0

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

-f=-72

f=-72/-1

f=+72

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