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18-2f=2f+4
We move all terms to the left:
18-2f-(2f+4)=0
We get rid of parentheses
-2f-2f-4+18=0
We add all the numbers together, and all the variables
-4f+14=0
We move all terms containing f to the left, all other terms to the right
-4f=-14
f=-14/-4
f=3+1/2
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