At a certain software company, the cost, C , of developing and producing a computer software program is related to the number of copies produced, x , by the equation C= 30000+2x . The company's total revenues, R , are related to the number of copies produced, x , by the equation R=6x10000 . How many copies must the company produce so that the total revenue is equal to the cost?

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5000

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6000

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75000

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9000

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10000