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-10-2+7f=10f+9
We move all terms to the left:
-10-2+7f-(10f+9)=0
We add all the numbers together, and all the variables
7f-(10f+9)-12=0
We get rid of parentheses
7f-10f-9-12=0
We add all the numbers together, and all the variables
-3f-21=0
We move all terms containing f to the left, all other terms to the right
-3f=21
f=21/-3
f=-7
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