Add 2x+y-z , 7x-4y+2z , -3x+4y
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(i) (7x−4y)+(2x+6y)=7x+2x−4y+6y=9x+2y
(ii) (9x2+5x)+(6x2−2x)=9x2+6x2+5x−2x=15x2+3x
(iii) (2a+b)+(6a2−7a−b)=6a2+2a−7a+b−b=6a2−5a
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