Помогите срочно решить пример..

x = y + 1/6
2*y^3 - 25/6*y + 233/54 = 0
y = u+v
2*(u^3+v^3) + 233/54 = 0
6*u*v = 25/6 -> u*v = 25/36

u^3 + (25/36)^3*1/u^3 + 233/108 = 0
u^3 = t

t^2 + 233/108*t + (25/36)^3 = 0

D = 179/54

t = -233/108 +-/36*sqrt(1074)