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Find the sum of the following expressions.
 
(i)7p + 6q, 5p - q, q + 16p
(ii)a + 5b + 7c, 2a + 10b + 9c
(iii)mn + t, 2mn - 2t, -3t + 3mn
(iv)u + v, u - v, 2u + 5v, 2u - 5v
(v)5xyz - 3xy, 3zxy - 5yx