8f-9=21+2f

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Solution for 8f-9=21+2f equation: 



8f-9=21+2f

We move all terms to the left:

8f-9-(21+2f)=0

We add all the numbers together, and all the variables

8f-(2f+21)-9=0

We get rid of parentheses

8f-2f-21-9=0

We add all the numbers together, and all the variables

6f-30=0

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

6f=30

f=30/6

f=5

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