х² = (х + 7)²,
х² = х² + 14х + 49,
х² - х² - 14х = 49,
-14х = 49,
х = -49/14,
х = -3,5
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х² = (х + 7)²,
х² = х² + 14х + 49,
х² - х² - 14х = 49,
-14х = 49,
х = -49/14,
х = -3,5