21f+17=80

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Solution for 21f+17=80 equation: 



21f+17=80

We move all terms to the left:

21f+17-(80)=0

We add all the numbers together, and all the variables

21f-63=0

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

21f=63

f=63/21

f=3

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