84=2f+6

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Solution for 84=2f+6 equation: 



84=2f+6

We move all terms to the left:

84-(2f+6)=0

We get rid of parentheses

-2f-6+84=0

We add all the numbers together, and all the variables

-2f+78=0

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

-2f=-78

f=-78/-2

f=+39

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