x² + 16x + 64 - 400 = x² - 64
x² + 16x - x² = 400 - 64 - 64
16x = 272
x = 17
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Verified answer
x² + 16x + 64 - 400 = x² - 64
x² + 16x - x² = 400 - 64 - 64
16x = 272
x = 17