7 x square y square - 5 x y
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qeajsbsvs. sys Feb sysbdgs sys
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if a is equal to 7 x square + 5 xy minus 9 y square and b is equal to minus 4 x square + xy + 5 y square and C is equal to 4 y square - 3 x square - 6 xy then show that a + b + C is equal to zero
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