12f+21=9f

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Solution for 12f+21=9f equation: 



12f+21=9f

We move all terms to the left:

12f+21-(9f)=0

We add all the numbers together, and all the variables

3f+21=0

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

3f=-21

f=-21/3

f=-7

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