4f-21=43

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Solution for 4f-21=43 equation: 



4f-21=43

We move all terms to the left:

4f-21-(43)=0

We add all the numbers together, and all the variables

4f-64=0

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

4f=64

f=64/4

f=16

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