1)my-3m³n+n²m²-n²m²=my-3m³n
2)9a³-3ab+5b³-3ab-8a³-10b³=a³-6ab-5b³
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1)my-3m³n+n²m²-n²m²=my-3m³n
2)9a³-3ab+5b³-3ab-8a³-10b³=a³-6ab-5b³