4a(2a2-6a)-3a3(5a2-4a+3)-a(a+2)
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the answer is 8a3-24a2-15a5+12a4-9a3-a2-2a
-a3-25a2-15a5+12a4-2a
-a3-25a2-15a5+12a4-2a
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