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If $A = \begin{bmatrix} 10 & 2k +5 \\ 3k - 3 & k +5 \end{bmatrix}$ is a  symmetric matrix, the value of $k$ is __________________.

  1. $8$
  2. $5$
  3. $-0.4$
  4. $\frac{1 + \sqrt{1561}}{12}$
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