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-10f-1=-9f-17
We move all terms to the left:
-10f-1-(-9f-17)=0
We get rid of parentheses
-10f+9f+17-1=0
We add all the numbers together, and all the variables
-1f+16=0
We move all terms containing f to the left, all other terms to the right
-f=-16
f=-16/-1
f=+16
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