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x² - 8x + 16 = 1 + 9 - 6x + x²
x² - 8x + 6x - x² = 1 + 9 - 16
-2x = -6 /:(-2)
x = 3
x (kwadrat)-x (kwadrat) - 8x+6x =10-16
-2x = -6 /:(-2)
x = 3