3f-21=75

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Solution for 3f-21=75 equation: 



3f-21=75

We move all terms to the left:

3f-21-(75)=0

We add all the numbers together, and all the variables

3f-96=0

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

3f=96

f=96/3

f=32

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