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99=18f-99
We move all terms to the left:
99-(18f-99)=0
We get rid of parentheses
-18f+99+99=0
We add all the numbers together, and all the variables
-18f+198=0
We move all terms containing f to the left, all other terms to the right
-18f=-198
f=-198/-18
f=+11
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