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-9f-1=-4-8f-16
We move all terms to the left:
-9f-1-(-4-8f-16)=0
We add all the numbers together, and all the variables
-9f-(-8f-20)-1=0
We get rid of parentheses
-9f+8f+20-1=0
We add all the numbers together, and all the variables
-1f+19=0
We move all terms containing f to the left, all other terms to the right
-f=-19
f=-19/-1
f=+19
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