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15n+24-4n-12+6-2n=105
We move all terms to the left:
15n+24-4n-12+6-2n-(105)=0
We add all the numbers together, and all the variables
9n-87=0
We move all terms containing n to the left, all other terms to the right
9n=87
n=87/9
n=9+2/3
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