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12-9f=-8f
We move all terms to the left:
12-9f-(-8f)=0
We get rid of parentheses
-9f+8f+12=0
We add all the numbers together, and all the variables
-1f+12=0
We move all terms containing f to the left, all other terms to the right
-f=-12
f=-12/-1
f=+12
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