please answer the questions
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(2a-3) (a^2-3a+5) - (a-1) (5a^2+3a-3)
2a^3-6a+10a-3a^2+9a-15 -(5a^3+3a^2-3a-5a^2-3a+3)
2a^3-6a+10a-3a^2+9a-15-5a^3-3a^2+3a+5a^2+3a-3)
-3a^3+19a-a^2-18
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