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How did Elon Musk become so rich?
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This week, the board of Twitter agreed to Elon Musk's $44-billion takeover offer, just less than two weeks after he made the bid. Musk, CEO of Tesla and the richest man on Earth, said he would unlock the "tremendous potential" of the company. So how did Elon Musk become so rich? Let's take a look.

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