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5f-2=f+18
We move all terms to the left:
5f-2-(f+18)=0
We get rid of parentheses
5f-f-18-2=0
We add all the numbers together, and all the variables
4f-20=0
We move all terms containing f to the left, all other terms to the right
4f=20
f=20/4
f=5
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