-(n2-n-10n+10)+n2+5n+2n+10= -n2+11n-10+n2+7n+10=18n
потом 18/9=2n
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-(n2-n-10n+10)+n2+5n+2n+10= -n2+11n-10+n2+7n+10=18n
потом 18/9=2n