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9+2n=9+3
We move all terms to the left:
9+2n-(9+3)=0
We add all the numbers together, and all the variables
2n+9-12=0
We add all the numbers together, and all the variables
2n-3=0
We move all terms containing n to the left, all other terms to the right
2n=3
n=3/2
n=1+1/2
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