# Every Equation Is Missing Something

Algebra Level 2

$\large{\begin{cases} x + y + u = 4 \\ y + u + v = -5 \\ u + v +x = 0 \\ v + x + y = -8 \end{cases}}$

Let $$x,y,u$$ and $$v$$ be numbers satisfying the system of equations above. Find the product $$xyuv$$.​

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