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(m - 3n)(m + 3n - 2)
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12m + 9n - 4 - 10m + 6n = 2m + 15n - 4
factor by grouping 7m(m-2)+6n(2-m)
3(3n - 1)(n + 1)
n^2(n + 6)(n^2 - 6n + 36)