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5f=3f+6
We move all terms to the left:
5f-(3f+6)=0
We get rid of parentheses
5f-3f-6=0
We add all the numbers together, and all the variables
2f-6=0
We move all terms containing f to the left, all other terms to the right
2f=6
f=6/2
f=3
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