The n is an unknown variable.
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10n + 3 = 7n + 53n = 2n = 2/3
so you set it up. 10n+5 divide each side by 5 n=2
An unknown or variable (n) multiplied by 10
10n+12 = 14n-12 10n-14 = -12-12 -4n = -24 n = 6
n - 10 + 9n - 3 = 10n - 13