x² - 6x + 9 + 9 - x² = x² + 4x + 4 - x²
10x = 9 - 4 + 9
10x = 14
x = 1,4
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x² - 6x + 9 + 9 - x² = x² + 4x + 4 - x²
10x = 9 - 4 + 9
10x = 14
x = 1,4