6=21-3f

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Solution for 6=21-3f equation: 



6=21-3f

We move all terms to the left:

6-(21-3f)=0

We add all the numbers together, and all the variables

-(-3f+21)+6=0

We get rid of parentheses

3f-21+6=0

We add all the numbers together, and all the variables

3f-15=0

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

3f=15

f=15/3

f=5

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