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-4f-7=-3f
We move all terms to the left:
-4f-7-(-3f)=0
We get rid of parentheses
-4f+3f-7=0
We add all the numbers together, and all the variables
-1f-7=0
We move all terms containing f to the left, all other terms to the right
-f=7
f=7/-1
f=-7
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