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-9-9f-3=-7f+8
We move all terms to the left:
-9-9f-3-(-7f+8)=0
We add all the numbers together, and all the variables
-9f-(-7f+8)-12=0
We get rid of parentheses
-9f+7f-8-12=0
We add all the numbers together, and all the variables
-2f-20=0
We move all terms containing f to the left, all other terms to the right
-2f=20
f=20/-2
f=-10
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