If $y(x) = \left| {\begin{array}{*{20}{c}}
{\sin x}&{\cos x}&{\sin x + \cos x + 1}\\
{27}&{28}&{27}\\
1&1&1
\end{array}} \right|$, $x \in \mathbb{R}$, then $\frac{{{d^2}y}}{{d{x^2}}} + y$ is equal to
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