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-2(2f+4)=8
We move all terms to the left:
-2(2f+4)-(8)=0
We multiply parentheses
-4f-8-8=0
We add all the numbers together, and all the variables
-4f-16=0
We move all terms containing f to the left, all other terms to the right
-4f=16
f=16/-4
f=-4
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