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-6-5f=-4f
We move all terms to the left:
-6-5f-(-4f)=0
We get rid of parentheses
-5f+4f-6=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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