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-2(2f-4)+4=-2f
We move all terms to the left:
-2(2f-4)+4-(-2f)=0
We multiply parentheses
-4f-(-2f)+8+4=0
We get rid of parentheses
-4f+2f+8+4=0
We add all the numbers together, and all the variables
-2f+12=0
We move all terms containing f to the left, all other terms to the right
-2f=-12
f=-12/-2
f=+6
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