$2.2.15$ Solve the equation. $$ \left(x^{3}+9 X^{3} y^{4} ight) d xte^{x^{4}} y^{3} d y=0 $$ An implicit solution in the form $\mathrm{F}(\mathrm{x}, \mathrm{y})=\mathrm{C}$ is $\square=\mathrm{C}$, where $\mathrm{C}$ is an arbitrary constant. (Type an expression using $x$ and $y$ as the variables.) CS.VS. 1362