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Mathematics in the second volume of the eighth grade (main process or detailed solution)
9m？ - 12mn+8n？ -4np+2p？ -4p+4

=9m？ - 12mn+4n？ +4n？ -4np+p？ +p？ -4p+4

=(9m？ - 12mn+4n？ )+(4n？ -4np+p？ )+(p？ -4p+4)

=(3m-2n)？ +(2n-p)？ +(p-2)？

Put 8n? Into 4n? +4n？

Put 2p? Split it into p? +p？

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