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\begin{equation}  \begin{align*}  \overset{(1)}{\frac{\partial \overset{(1)}{ \frac{\partial  u}{\partial t}}+ u\frac{\partial t}}  + \overset{(2)}{u\frac{\partial  u}{\partial x}+v\frac{\partial x}}  + \overset{(3)}{v\frac{\partial  u}{\partial y}-K\left(\frac{{\partial y}}  - \overset{(4)}{K\left(\frac{{\partial  }^2u}{\partial x^2}+\frac{{\partial }^2u}{\partial y^2}\right)&=0 y^2}\right)}  &= 0  \\ %newline  \frac{\partial v}{\partial t}+ t }+  u\frac{\partial v}{\partial x}+v\frac{\partial v}{\partial y}-K\left(\frac{{\partial }^2v}{\partial x^2}+\frac{{\partial }^2v}{\partial y^2}\right)&=0\ \end{align*}  \end{equation}