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5f-3=20+4f
We move all terms to the left:
5f-3-(20+4f)=0
We add all the numbers together, and all the variables
5f-(4f+20)-3=0
We get rid of parentheses
5f-4f-20-3=0
We add all the numbers together, and all the variables
f-23=0
We move all terms containing f to the left, all other terms to the right
f=23
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