UPDATE 4-Exxon tries to put the worst behind it with $20 bln writedown
(Adds five-year share price performance)By Jennifer HillerHOUSTON, Nov 30 (Reuters) - Exxon Mobil Corp on Monday said it would write down the value of natural gas properties by $17 billion to $20 billion, its biggest ever impairment, and slash pr...
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