Subtract −m^2+ 5m^2n^2−8mn−7 from 3m(m^2−4mn^2−4n)
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3m(m^2-4mn^2-4n) - m^2+5m^2n^2-8mn-7
3m^3-12m^2n^2-12mn-m^2+5m^2n^2-8mn-7
3m^3-12m^2n^2+5m^2n^2-12mn-8mn-m^2-7
3m^3-7m^2n^2-20mn-m^2-7
3m^3-7m^2n^2-m^2-20mn-7
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