16x² - 49c² = (4х - 7с) * (4х + 7с)
(P - 3) * (p + 3) = р² - 9
(5a - 6d) * (5a + 6d) = 25а² - 36d²
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16x² - 49c² = (4х - 7с) * (4х + 7с)
(P - 3) * (p + 3) = р² - 9
(5a - 6d) * (5a + 6d) = 25а² - 36d²