y'(x)=\frac{\sqrt{x} \left(-108 x^{3/2} y(x)+18 x^{9/2}-108 x^{3/2}+x^9-18 x^6 y(x)+108 x^3 y(x)^2-216 y(x)^3\right)}{36 x^3-216 y(x)-216}