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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