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17=2f-1
We move all terms to the left:
17-(2f-1)=0
We get rid of parentheses
-2f+1+17=0
We add all the numbers together, and all the variables
-2f+18=0
We move all terms containing f to the left, all other terms to the right
-2f=-18
f=-18/-2
f=+9
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