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Dear Student,

Please find the below required solution.

i) S u b t r a c t 4 x - 5 y + 3 z f r o m 2 x - 3 y + 7 z 2 x - 3 y + 7 z - (4 x - 5 y + 3 z) = 2 x - 3 y + 7 z - 4 x + 5 y - 3 z = 2 x - 4 x - 3 y + 5 y + 7 z - 3 z = - 2 x + 2 y + 4 z i i) S u b t r a c t 7 x^{3} - 2 x + 5 f r o m 8 x^{3} - 2 x^{2} + 7 8 x^{3} - 2 x^{2} + 7 - (7 x^{3} - 2 x + 5) = 8 x^{3} - 2 x^{2} + 7 - 7 x^{3} + 2 x - 5 = 8 x^{3} - 7 x^{3} - 2 x^{2} + 2 x + 7 - 5 = x^{3} - 2 x^{2} + 2 x + 2

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