If the set of all $a \in \mathbf{R}$, for which the equation $2 x^2+(a-5) x+15=3$ a has no real root, is the interval $(\alpha, \beta)$, and X = {x $\in$ Z : $\alpha$ < x < $\beta$}, then $\displaystyle\sum_{x \in X} x^2$ is equal to:
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