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-9+4f=-3+7f
We move all terms to the left:
-9+4f-(-3+7f)=0
We add all the numbers together, and all the variables
4f-(7f-3)-9=0
We get rid of parentheses
4f-7f+3-9=0
We add all the numbers together, and all the variables
-3f-6=0
We move all terms containing f to the left, all other terms to the right
-3f=6
f=6/-3
f=-2
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