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-8f-9=-7f-2
We move all terms to the left:
-8f-9-(-7f-2)=0
We get rid of parentheses
-8f+7f+2-9=0
We add all the numbers together, and all the variables
-1f-7=0
We move all terms containing f to the left, all other terms to the right
-f=7
f=7/-1
f=-7
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