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4n-3=2n+9=
We move all terms to the left:
4n-3-(2n+9)=0
We get rid of parentheses
4n-2n-9-3=0
We add all the numbers together, and all the variables
2n-12=0
We move all terms containing n to the left, all other terms to the right
2n=12
n=12/2
n=6
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