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11f+11-4f-3=f+20
We move all terms to the left:
11f+11-4f-3-(f+20)=0
We add all the numbers together, and all the variables
7f-(f+20)+8=0
We get rid of parentheses
7f-f-20+8=0
We add all the numbers together, and all the variables
6f-12=0
We move all terms containing f to the left, all other terms to the right
6f=12
f=12/6
f=2
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