9f+9=21

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Solution for 9f+9=21 equation: 



9f+9=21

We move all terms to the left:

9f+9-(21)=0

We add all the numbers together, and all the variables

9f-12=0

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

9f=12

f=12/9

f=1+1/3

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