-5a³-(3a²-(a³-(3-a-a²))-(8a³+4a²-a)=
=-5a³-(3a²-(a³-3+a+a²))-8a³-4a²+a=
=-5a³-(3a²-a³+3-a-a²)-8a³-4a²+a=
=-5a³-(2a²-a³+3-a)-8a³-4a²+a=
=-5a³-2a²+a³-3+a-8a³-4a²+a=
=-12a³-6a²+2a-3
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-5a³-(3a²-(a³-(3-a-a²))-(8a³+4a²-a)=
=-5a³-(3a²-(a³-3+a+a²))-8a³-4a²+a=
=-5a³-(3a²-a³+3-a-a²)-8a³-4a²+a=
=-5a³-(2a²-a³+3-a)-8a³-4a²+a=
=-5a³-2a²+a³-3+a-8a³-4a²+a=
=-12a³-6a²+2a-3