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8f+13=5f-20
We move all terms to the left:
8f+13-(5f-20)=0
We get rid of parentheses
8f-5f+20+13=0
We add all the numbers together, and all the variables
3f+33=0
We move all terms containing f to the left, all other terms to the right
3f=-33
f=-33/3
f=-11
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