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2. 9m3 - 3m4 + 9m2 -3m3 = 6m3 - 3m4 +9m2
3. p3 + 2p2 - p -p2 -2p +1= p3 + p2 - 3p + 1
2. 9m³-3+9m²-3m³
3. p³+2p²-p-p²-2p+1