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18f-16=21f+2
We move all terms to the left:
18f-16-(21f+2)=0
We get rid of parentheses
18f-21f-2-16=0
We add all the numbers together, and all the variables
-3f-18=0
We move all terms containing f to the left, all other terms to the right
-3f=18
f=18/-3
f=-6
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