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Beastiechica ∙
it equals -15
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12m + 9n - 4 - 10m + 6n = 2m + 15n - 4
5n+6n-2n can be solved by combining like terms. Combine 5n and 6n and -2n to get 9n.
3(3n - 1)(n + 1)
15m + 4n - 5m + 9n = 10m + 13n
6n(2n - 3)