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3m - 3m + 6 - 6m + 8 - 20m - 20n + 12m - 12
Agrupas los términos semejantes.
6 - 6m + 8 - 20m - 20n + 12m - 12
6 + 8 - 12 - 6m - 20m - 20n.
2 - 26m - 20n