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17=3f+8f=
We move all terms to the left:
17-(3f+8f)=0
We add all the numbers together, and all the variables
-(+11f)+17=0
We get rid of parentheses
-11f+17=0
We move all terms containing f to the left, all other terms to the right
-11f=-17
f=-17/-11
f=1+6/11
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