3f-12=21

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Solution for 3f-12=21 equation: 



3f-12=21

We move all terms to the left:

3f-12-(21)=0

We add all the numbers together, and all the variables

3f-33=0

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

3f=33

f=33/3

f=11

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