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At the end of a certain year, the four companies with the largest number of home...

At the end of a certain year, the four companies with the largest number of home Internet users in the United States were Microsoft, Time Warner, Yahoo, and Google, with a combined audience of 284 million users. Taking x to be the Microsoft audience in millions, y the Time Warner audience in millions, z the Yahoo audience in millions, and u the Google audience in millions, it was observed that

z − u = 3(x − y) + 24
x + y = 48 + z + u
and   x − y + z − u = 56.

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

Microsoft     million
Time Warner     million
Yahoo     million
Google      million
Math   Precalculus   
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