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x and y are real numbers such that x2 + 3y = 9, and 2y2 - 6x = 18. If the 4 solutions to the system are (x1 ,y1 ), (x2 ,y2 ), (x3 ,y3 ), and (x4 ,y4 ), then find (y1 - x1 ) + (y2 - x2 ) + (y3 - x3 ) + (y4 - x4 ).
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