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2x 2y. X 2y 7 2y2 XY 14. Система x+2y=7; 2y^2+XY=14. X+2y=7 2y+XY=14. X2-XY-14x+14y.
X 2y 7 2y2 XY 14. Система x+2y=7; 2y^2+XY=14. X+2y=7 2y+XY=14. X2-XY-14x+14y.

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