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f=8+2f
We move all terms to the left:
f-(8+2f)=0
We add all the numbers together, and all the variables
f-(2f+8)=0
We get rid of parentheses
f-2f-8=0
We add all the numbers together, and all the variables
-1f-8=0
We move all terms containing f to the left, all other terms to the right
-f=8
f=8/-1
f=-8
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