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-4f=-2f+6
We move all terms to the left:
-4f-(-2f+6)=0
We get rid of parentheses
-4f+2f-6=0
We add all the numbers together, and all the variables
-2f-6=0
We move all terms containing f to the left, all other terms to the right
-2f=6
f=6/-2
f=-3
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