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13f-16=18f-11
We move all terms to the left:
13f-16-(18f-11)=0
We get rid of parentheses
13f-18f+11-16=0
We add all the numbers together, and all the variables
-5f-5=0
We move all terms containing f to the left, all other terms to the right
-5f=5
f=5/-5
f=-1
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