р(m +3n) — n(Зp - m) - 2pm =
=pm+3pn-3pn+nm-2pm= (1-2)pm +(3-3)pn+nm=
=-pm+nm=m(n - р)
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р(m +3n) — n(Зp - m) - 2pm =
=pm+3pn-3pn+nm-2pm= (1-2)pm +(3-3)pn+nm=
=-pm+nm=m(n - р)