5a-[a2- {2a(1-a+ 4a2)-3a (a2-5a-3)}]-8a
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5a-[2a-{2a(1-a+4*2a)-3a(2a-5a-3)}]-8a
5a-[2a-{2a(1-7a)-3a(-3a-3)}]-8a
5a-[2a{2a-14a²+9a²+9a}]-8a
5a-[2a{11a-5a²}]-8a
5a-[22a²-10a³]-8a
5a-22a²+10a³-8a
10a³-22a²-3a this is answer
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