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11=18+7f=6
We move all terms to the left:
11-(18+7f)=0
We add all the numbers together, and all the variables
-(7f+18)+11=0
We get rid of parentheses
-7f-18+11=0
We add all the numbers together, and all the variables
-7f-7=0
We move all terms containing f to the left, all other terms to the right
-7f=7
f=7/-7
f=-1
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