subtract
x^2+xy+z from 2x^2+xy+2
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Add x2 + 2xy + y2 to the sum of x2 − 3y2 and 2x2 − y2+ 9. ... Subtract: (i) 6x3-7x2+5x-3 from 4-5x+6x2-8x3 (ii) -x2-3z from 5x2-y+z+7
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