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5(3f+9)=15f+45
We move all terms to the left:
5(3f+9)-(15f+45)=0
We multiply parentheses
15f-(15f+45)+45=0
We get rid of parentheses
15f-15f-45+45=0
We add all the numbers together, and all the variables
=0
f=0/1
f=0
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