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