e) al + 2ab + b and a? - 2ab + b2
xy - yz + 2; 2yz + xy - 7 and 3xy + 3y2 + 3
372. 3y2 + 3 - x2 and x2 + y2 + 5
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2x+5xggffsddgxdgsfccfff ok
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