21-9f=84

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Solution for 21-9f=84 equation: 



21-9f=84

We move all terms to the left:

21-9f-(84)=0

We add all the numbers together, and all the variables

-9f-63=0

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

-9f=63

f=63/-9

f=-7

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