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Add: (i) 3a - 2b + 5c, 2a + 5b - 7c, -...

Add:
(i) 3a - 2b + 5c, 2a + 5b - 7c, -a - b + c
(ii) 8a - 6ab + 5b, -6a - ab - 8b, -4a + 2ab + 3b
(iii) `2x^(3) - 3x^(2) + 7x - 8, -5x^(3) + 2x^(2) - 4x + 1, 3 - 6x + 5x^(2) - x^(3)`
(iv) `2x^(2) - 8xy + 7y^(2) - 8xy^(2), 2xy^(2) + 6xy - y^(2) + 3x^(2), 4y^(2) - xy - x^(2) + xy^(2)`
(v) `x^(3) + y^(3) - z^(3) + 3xyz, - x^(3) + y^(3) + z^(3) - 6xyz, - x^(3) - y^(3) - z^(3) - 8xyz`
(vi) `2 + x - x^(2) + 6x^(3). -6 - 2x + 4x^(2) - 3x^(3). 2 + x^(2). 3 - x^(3) + 4x - 2x^(2)`

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