(2x - 3y) (x - y)
(x³ + y³ ) (7x + 2)
(x² + 11) (x² - 11)
(3zt - 2t² ) (tz - z² )
7x³ +2x³ +7xy³ +2y³
5z² t² - 3z³ t - 2t³ z
x4-121
2x 2 -5xy+3y 2
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