9+3f=21

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Solution for 9+3f=21 equation: 



9+3f=21

We move all terms to the left:

9+3f-(21)=0

We add all the numbers together, and all the variables

3f-12=0

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

3f=12

f=12/3

f=4

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