Add:
(1) $4 x y + 5 x^{2}$ and $6 x y - 2 x^{2}$
(2) $3 x + y$ and $3 x - 7 y$
(3) $3 x^{2} y - 4$ and $6 x y^{2} + 8$

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Solution

(1) $4 x y + 5 x^{2} + 6 x y - 2 x^{2} = 10 x y + 3 x^{2}$
(2) $3 x + 3 x + y - 7 y = 6 x - 6 y$
(3) $3 x^{2} y + 6 x^{2} y - 4 + 8 = 9 x y^{2} + 4$

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