Find the sum of the expressions :
(i) 3x + 4xy – y2; xy - 4x + 2y2; 3y2 - xy + 6x
(ii) x2 – xy + yz; 2xy + yz – 2x2; 3yz + 3x2 + xy
(iii) 3x + 4y + 7z; – 5x + 3y - 6z; 4x - 3y - 4z
(iv) 4x2 + 7 – 3x; 4x –- x2 + 8; -10 + 5x – 2x2
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