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