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Verified answer
5ab(a²-2ab-b²)-3b(a³-a²b+ab²)=5a³b-10a²b²-5ab³-3a³b+3a²b²-3ab³=5a³b-3a³b-10a²b²+3a²b²-5ab³-3ab³
=2a³b-7a²b²-8ab³