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6. Simplify:(i) 2p3 3p2 + 4p - 5-6p3 +2p2 - 8p - 2 + 6p +8(ii) 2x2-xy + 6x-4y + 5xy-4x + 6x2 +3y(iii) x4-6x3+2x__ 7 + 7x3-x+5x2+2-x4

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