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The pipeline operator MPLX said on Monday that it had agreed to acquire MarkWest Energy Partners, in a deal that values the company at about $20 billion, including debt. The deal would combine two companies structured as so-called master limited partnerships to own oil pipelines and petroleum or natural gas storage assets. The combined company would have a market capitalization of about $21 billion. Under the terms of the deal, MarkWest shareholders would receive the equivalent of $78.64 a share in cash and shares, representing a 32 percent premium to the company