9=21-3f

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Solution for 9=21-3f equation: 



9=21-3f

We move all terms to the left:

9-(21-3f)=0

We add all the numbers together, and all the variables

-(-3f+21)+9=0

We get rid of parentheses

3f-21+9=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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