How can Monism (Advaita) and Dualism (Dvaita), with reference to the Upanishads, be shown to be one and the same?

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Neither the Advaitis nor the Dwaitis would accept this equation. Each side is biased by what their preceptors have said. And the debate goes on, about which is the right view. I think if we can see that both are same, many confusions would get resolved. But how do we do that within the framework of the Upanishads?