from the sum of 2 X square + 3 x squared minus 5 and 7 + 2 x y minus x square public 3 X square + x square - 2
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From the sum of 2x²+ 3xy - 5 and 7 + 2xy - x subtract 3xy + x² -2. ⇒ 2x² + 5xy + 2 -x. Therefore the addition of 2x²+ 3xy - 5 and 7 + 2xy - x is 2x² + 5xy + 2 -x.
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12x^4+40^3-3x^2-8x-21
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