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