systems of linear equations application

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Question description

At the end of a certain year, the four organizations ranking 5 through 8 in home Internet users in the United States were eBay, the U.S. Government, Amazon, and Lycos, with a combined audience of 112 million users. Taking x to be the eBay audience in millions, y the U.S. Government audience in millions, z the Amazon audience in millions, and u the Lycos audience in millions, it was observed that
y - z = z - u

x - y = 3(y-u) + 14 

x - y + z - u = 28

How large was the audience of each of the four companies at the end of that year?

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(Top Tutor) Daniel C.
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