84=f-81

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Solution for 84=f-81 equation: 



84=f-81

We move all terms to the left:

84-(f-81)=0

We get rid of parentheses

-f+81+84=0

We add all the numbers together, and all the variables

-1f+165=0

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

-f=-165

f=-165/-1

f=+165

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