Subtract (3a²-5a+5) and (a³-5a²+8) from (7a²-4a²-9)
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(7a²-4a²-9)-(3a²-5a+5)-(a³-5a²+8)
=3a²-9-3a²+5a-5-a³+5a²-8
= -a³+5a²+5a-17
=3a²-9-3a²+5a-5-a³+5a²-8
= -a³+5a²+5a-17
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