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(5f/2)-9=21
We move all terms to the left:
(5f/2)-9-(21)=0
We add all the numbers together, and all the variables
(+5f/2)-9-21=0
We add all the numbers together, and all the variables
(+5f/2)-30=0
We get rid of parentheses
5f/2-30=0
We multiply all the terms by the denominator
5f-30*2=0
We add all the numbers together, and all the variables
5f-60=0
We move all terms containing f to the left, all other terms to the right
5f=60
f=60/5
f=12
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