18=(-f)=91

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Solution for 18=(-f)=91 equation: 



18=(-f)=91

We move all terms to the left:

18-((-f))=0

We add all the numbers together, and all the variables

-((-1f))+18=0



We calculate terms in parentheses: -((-1f)), so:

(-1f)

We get rid of parentheses

-f

Back to the equation:

-(-f)



We add all the numbers together, and all the variables

-(-1f)+18=0

We get rid of parentheses

1f+18=0

We add all the numbers together, and all the variables

f+18=0

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

f=-18

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