Formula_22856

\[\begin{gathered}u_{t}-6 u u_{x}+u_{x x x}= \\=\left(1+\varepsilon \frac{\partial}{\partial x}+2 \varepsilon^{2} w\right)\left(w_{t}-6 w w_{x}-6 \varepsilon^{2} w^{2} w_{x}+w_{x x x}\right) .\end{gathered}\]