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-2-3f=-2f-8
We move all terms to the left:
-2-3f-(-2f-8)=0
We get rid of parentheses
-3f+2f+8-2=0
We add all the numbers together, and all the variables
-1f+6=0
We move all terms containing f to the left, all other terms to the right
-f=-6
f=-6/-1
f=+6
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