3=21-2f

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Solution for 3=21-2f equation: 



3=21-2f

We move all terms to the left:

3-(21-2f)=0

We add all the numbers together, and all the variables

-(-2f+21)+3=0

We get rid of parentheses

2f-21+3=0

We add all the numbers together, and all the variables

2f-18=0

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

2f=18

f=18/2

f=9

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