5a -[a² -{2a(1-a+4a²)-3a(a²-5a-3)}]-8a
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5a-[a²-{2a(1-a+4a²)-3a(a²-5a-3)}]-8a
=5a-[a²-{2a-2a²+8a³-3a³+15a²+9a}]-8a
=5a-[a²-2a+2a²-8a³+3a³-15a²-9a]-8a
=5a-[-9a²-11a-5a³]-8a
=5a+9a²+11a+5a³-8a
=8a+9a²+5a³
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