If the matrix \( \left[\begin{array}{ccc}x+4 & x & x \\ x & x+4 & x \\ x & x & x+4\end{array}\ri...
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If the matrix \( \left[\begin{array}{ccc}x+4 & x & x \\ x & x+4 & x \\ x & x & x+4\end{array}\right] \) is singular, find \( x \).
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