1. Add:
(i) - 5y²z, 14yzz and -10y2z.
(ii) 2a+b + 3ab2 and -ab2 + 5a-b
(iii) 5a²b + 3ab2 and 3a+b + 5ab2
(iv) 3a - 56, 5a + 7b and 8a - 26
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