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4f+20=7f-4
We move all terms to the left:
4f+20-(7f-4)=0
We get rid of parentheses
4f-7f+4+20=0
We add all the numbers together, and all the variables
-3f+24=0
We move all terms containing f to the left, all other terms to the right
-3f=-24
f=-24/-3
f=+8
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