-4f=-84

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Solution for -4f=-84 equation: 



-4f=-84

We move all terms to the left:

-4f-(-84)=0

We add all the numbers together, and all the variables

-4f+84=0

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

-4f=-84

f=-84/-4

f=+21

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