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=(-2a²×5a²)+(-2a²×4a)+(-2a²×4)+(-3a×5a²)+(-3a×4a)+(-3a×-2)
=-10a⁴-8a³+4a²-15a³-12a²-6a
=-10a⁴+(-8a³-15a³)+(4a-12a²)-6a
=-10a⁴-23a³-8a²-6a