add 4x²–5xy+3y,8x²+7xy–6y²–2x²–9xy+3xy²
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4x^2-5xy+3y^2 , 8x^2 + 7xy – 6y^2 and -2x^2 – 9xy +13y^2 = 10x^2-7xy+10y^2)
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