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-2-5f=-4f
We move all terms to the left:
-2-5f-(-4f)=0
We get rid of parentheses
-5f+4f-2=0
We add all the numbers together, and all the variables
-1f-2=0
We move all terms containing f to the left, all other terms to the right
-f=2
f=2/-1
f=-2
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