121x³ - 22x² + x = 0;

x(121x^2 - 22x + 1) = 0;

x(11x - 1)^2 = 0;

1) x = 0;

2) (11x - 1)^2 = 0;

11x - 1 = 0;

11x = 1;

x = 1/11.