x (x + 1) - x - 1 = 0, x(x + 1) + x + 1 = 0, x(x+1)-x²+1=0, √(x² - x - 1) - √(x - 1) = 0, x(x + 1) - x - 1 = 0, x(x-1) + x - 1 = 0, \( x(x-1) + x - 1 = 0 \)