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The equation "9n equals 126" can be written as 9n = 126.
9n + 18 = 81 9n = 63 n = 7
9n+9=81 9n=72 n=8
9n - 9 = 45 9n = 45 + 9 = 54 n = 54 / 9 = 6
it equals -15