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-12=-2f-4f
We move all terms to the left:
-12-(-2f-4f)=0
We add all the numbers together, and all the variables
-(-6f)-12=0
We get rid of parentheses
6f-12=0
We move all terms containing f to the left, all other terms to the right
6f=12
f=12/6
f=2
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