Not quadratic!

Algebra Level 4

{x2+xy10x+2y=4y2+xy10y+2x=12 \large\begin{cases}x^2+xy-10x+2y=-4 \\ y^2+xy-10y+2x=-12\end{cases}

Let xx and yy be numbers satisfying the system of equations above. Find the value of xyx-y.

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