Question: Let D: (P and Q) -> R. E: (P -> R) and (Q -> R) Formulate a logical argument whether D and E are equivalent.

Let D: (P and Q) -> R. E: (P -> R) and (Q -> R) Formulate a logical argument whether D and E are equivalent. I know they are equivalent by using truth tables but I'll not sure how to show this by formulating a logical argument. Please help

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