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N stands for molality and it indicates the number of moles of a substance in a unit mass of the solution.
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n * 2n = 2n2
14-2n = 12
2n2 / n = 2n
7-2n=n-147-2n+2n=n-14+2n7=3n-147+14=3n21=3n21/3=3n/37=n
2n is 2 times n.