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-2f-1=-8-9-4f
We move all terms to the left:
-2f-1-(-8-9-4f)=0
We add all the numbers together, and all the variables
-2f-(-4f-17)-1=0
We get rid of parentheses
-2f+4f+17-1=0
We add all the numbers together, and all the variables
2f+16=0
We move all terms containing f to the left, all other terms to the right
2f=-16
f=-16/2
f=-8
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