-3
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5n + 6n - 2n
That factors to (2n + 1)(n + 2)
2n/5 or 2/5n
-2
5n + 12 = 3n Try to get all expressions with n on the left side 5n + 12 - 3n = 3n - 3n 2n + 12 = 0 Try to get rid of 12 on the left side 2n + 12 - 12 = -12 2n = -12 n = -12/2 = -6