A curve has equation ${x^2} + 2{y^2} + 5x + 6y = 10$. Find the equation of the tangent to the curve at the Point $\left( {2,\,\, - 1} \right)$. Give your answer in the form $\alpha x + by + c = 0$, where $\alpha $, $b$ and $c$ are integers.
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