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