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If A = 7x^(2) + 5xy - 9y^(2), B = - 4x^(...

If `A = 7x^(2) + 5xy - 9y^(2), B = - 4x^(2) + xy + 5y^(2)` and `C = 4y^(2) - 3x^(2) - 6xy` then show that A + B + C = 0

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