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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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