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simplify: (i) 2p^(3) - 3p^(2) + 4p - 5...

simplify:
(i) `2p^(3) - 3p^(2) + 4p - 5- 6p^(3) + 2p^(2) - 8p - 2 + 6p + 8`
(ii) `2x^(2) - xy + 6x - 4y + 5xy - 4x + 6x^(2) + 3y`
(iii) `x^(4) - 6x^(3) + 2x - 7 + 7x^(3) - x + 5x^(2) + 2 - x^(4)`

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