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18=f/7+11
We move all terms to the left:
18-(f/7+11)=0
We get rid of parentheses
-f/7-11+18=0
We multiply all the terms by the denominator
-f-11*7+18*7=0
We add all the numbers together, and all the variables
-1f+49=0
We move all terms containing f to the left, all other terms to the right
-f=-49
f=-49/-1
f=+49
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