6. Add:
(i) 3x - 1, 2x + 5, and 6 - x
(iii) 7x - 5 and 3x + 11
(ii) 8xy - 1,1 + 4xy, -2 and 1 + 2xy
(iv) 7x - 5 + 8z and 3x + 15
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