4f+21=77

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Solution for 4f+21=77 equation: 



4f+21=77

We move all terms to the left:

4f+21-(77)=0

We add all the numbers together, and all the variables

4f-56=0

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

4f=56

f=56/4

f=14

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