n + 8 = 12
Subtract 8 from each side:
n = 4
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2n plus 7 equals 19 2n equals 12 n equals 6
It is a simple linear equation in a single variable, n. And, in case you are wondering, n = 12.
8 = 12 is FALSE. So, the value of n, in a false statement can be anything at all.
your expression is this... n+5=3+12 n+5=15 n=10
7n + 1 = 6n + 8 7n=6n+7 (minus 1 from each side) n=7 (7n-6n equals n, you are left with n=7)