Объяснение:
[tex] - (20x + 9y) + (15x - 15y) = - 20x - 9y + 15x - 15y = - 5x - 24y[/tex]
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Объяснение:
[tex] - (20x + 9y) + (15x - 15y) = - 20x - 9y + 15x - 15y = - 5x - 24y[/tex]