Add:
(1) $2 x$ and $2 x - 3$
(2) $4 m^{2} + 7$ and $3 m^{2}$
(3) $- 6 m - 3$ and $9$
(4) $- 5 n$ and $8 n + 7$
(5) $8 x^{2} + 7$ and $- 8 x^{2}$
(6) $3 x y - 5$ and $9 x y$

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Solution

(1) $2 x + 2 x - 3 = 4 x - 3$
(2) $4 m^{2} + 3 m^{2} + 7 = 7 m^{2} + 7$
(3) $- 6 m - 3 + 9 = - 6 m + 6$
(4) $8 n - 5 n + 7 = 3 n + 7$
(5) $8 x^{2} + 7 - 8 x^{2} = 7$
(6) $3 x y + 9 x y - 5 = 12 x y - 5$

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