Add: $3 x^{2} y - 5 x y^{2} - 6 x y$ , $- 7 x y^{2} + 4 x^{2} y$ and $- 5 x y - 6 x^{2} y + 7 y^{2} x$

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Solution

Consider, $(3 x^{2} y - 5 x y^{2} - 6 x y) + (4 x^{2} y - 7 x y^{2}) + (- 6 x^{2} y + 7 x y^{2} - 5 x y)$

$= 3 x^{2} y + 4 x^{2} y - 6 x^{2} y - 5 x y^{2} - 7 x y^{2} + 7 x y^{2} - 5 x y - 6 x y$

$= (x^{2} y - 5 x y^{2} - 11 x y)$

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