Ответ:
[tex]2x {}^{2} + 14x - 3x - 21 = 2x {}^{2} - 3x + 2xy - 3y = 11x - 21 + 2xy - 3y[/tex]
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Ответ:
[tex]2x {}^{2} + 14x - 3x - 21 = 2x {}^{2} - 3x + 2xy - 3y = 11x - 21 + 2xy - 3y[/tex]