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2x - 3 + x - 1 = 6x - x² - 6
x² - 3x = -2
x² - 3x + 2 = 0
Δ = (-3)² - 4 * 1 * (2) = 9 - 8 = 1
x1 = (3 + 1) / 2 = 2
x2 = (3 - 1) / 2 = 1
x = 1 lub x = 2