What is the value of x + y in example 1 in the picture?

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And this task is too simple to be a single mission - to find the sum of the two is unknown, although it can be for first grade some test.\r\n\r\polojeniem the first two equations, we derive that the nine desired amounts equal 9009.\r\n\r\PA one, of course, 1001.\r\n\r\petvet : 1001
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