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15n-11n+2n-2n+2n=18
We move all terms to the left:
15n-11n+2n-2n+2n-(18)=0
We add all the numbers together, and all the variables
6n-18=0
We move all terms containing n to the left, all other terms to the right
6n=18
n=18/6
n=3
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