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12-3f=-7f
We move all terms to the left:
12-3f-(-7f)=0
We get rid of parentheses
-3f+7f+12=0
We add all the numbers together, and all the variables
4f+12=0
We move all terms containing f to the left, all other terms to the right
4f=-12
f=-12/4
f=-3
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