Solving inverse differential equation

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How to solve

$$ \frac{1}{D_{x}^{2}+D_{x}D_{y}-12D_{y}^{2}}(ye^{3x+y}+x^{3})? $$

I understand that I need to use $$ \frac{1}{\varphi(D_{x},D_{y})}(e^{ax+by}.V(x,y))=e^{ax+by}\frac{1}{\varphi(D_{x}+a,D_{y}+b)}V(x,y) $$ but I don't know how.