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