It is a simple linear equation in a single variable, n.
And, in case you are wondering, n = 12.
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10n+12 = 14n-12 10n-14 = -12-12 -4n = -24 n = 6
2n plus 7 equals 19 2n equals 12 n equals 6
-24
your expression is this... n+5=3+12 n+5=15 n=10
n + 8 = 12Subtract 8 from each side:n = 4