7.5=3f-21

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Solution for 7.5=3f-21 equation: 



7.5=3f-21

We move all terms to the left:

7.5-(3f-21)=0

We get rid of parentheses

-3f+21+7.5=0

We add all the numbers together, and all the variables

-3f+28.5=0

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

-3f=-28.5

f=-28.5/-3

f=9+1/2

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