(a²b-2ab²-b³)÷b-(a+b)(a-b)
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(a²b-2ab²-b³)÷b-(a+b)(a-b)
(a²b-2ab²-b³)÷b-(a+b)(a-b)
(a²b-2ab²-b³)÷b-(a+b)(a-b)