/*(x² - 1)
2*(x-1) + (x+1)² = x²
2x - 2 + x² + 2x + 1 - x² = 0
4x - 1 = 0
4x = 1 /:4
x = ¼
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/*(x² - 1)
2*(x-1) + (x+1)² = x²
2x - 2 + x² + 2x + 1 - x² = 0
4x - 1 = 0
4x = 1 /:4
x = ¼