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18f-13=12f+20
We move all terms to the left:
18f-13-(12f+20)=0
We get rid of parentheses
18f-12f-20-13=0
We add all the numbers together, and all the variables
6f-33=0
We move all terms containing f to the left, all other terms to the right
6f=33
f=33/6
f=5+1/2
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