85=2f+21

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Solution for 85=2f+21 equation: 



85=2f+21

We move all terms to the left:

85-(2f+21)=0

We get rid of parentheses

-2f-21+85=0

We add all the numbers together, and all the variables

-2f+64=0

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

-2f=-64

f=-64/-2

f=+32

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