y(x) \left(a f(x)^2-\frac{f''(x)}{f(x)}+3 f'(x)+\frac{3 f'(x)^2}{f(x)^2}\right)+b f(x)^3-\left(\frac{f'(x)}{f(x)}+f(x)\right) \left(3 y'(x)+y(x)^2\right)+y''(x)+y(x) y'(x)-y(x)^3=0