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= 15n^6 -5n^6 + 3 + 8
= 10n^6 + 11
(5p^2 + 6q^4) + (-p^2 + q^4 - 4p^2)
= (5p^2 + 6q^4) + (-5p^2 + q^4)
= 5p^2 -5p^2 + 6q^4 + q^4
= 7q^4
5(m^2 + 2n^3) + 3(2m^2 - 3n^3)
= (5m^2 + 10n^3) + (6m^2 - 9n^3)
= 5m^2 + 6m^2 + 10n^3 - 9n^3
= 11m^2 + n^3