Irving-based Exxon Mobil Corp. agreed to sell a stake in its Japanese refining and marketing business to TonenGeneral Sekiyu KK in a $3.9 billion deal as the world’s largest energy company shifts to the higher returns from pumping oil and gas. TonenGeneral will buy 99 percent of ExxonMobil Yugen Kaisha, a Japanese unit that mainly engages in refining and retail sales.

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