x² + y², 2x², -3x², 4y² - find the sums
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=X square + Y square + 2 x square - 3 x square + 4 y square
= x square + 2 x square - 3 x square + y square + 4 y square
= 3 x square - 3 x square + 5 y square
= x square + 5 y square
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