Fill in the blanks :
(i) 2a + b - c = 2a + (..............)
(ii) 3x - z + y = 3x - (..............)
(iii) 6p - 5x + q = 6p - (..............)
(iv) a + b - c + d = a + (..............)
(v) 5a + 4b + 4x - 2c = 4x - (................)
(vi) 7x + 2z + 4y - 3 = -3 + 4y + (.............)
(vii) 3m - 2n + 6 = 6 - (...............)
(viii) 2t + r - p - q + s = 2t + r - (...............)