The given equation can be written as AX = B, where A is the coefficient matrix, X is the variable matrix, and B is the constant matrix.
A = \begin{bmatrix} 1 & 2 & 4 \\ 3 & 8 & 14 \\ 2 & 6 & 13 \end{bmatrix}
X = \begin{bmatrix} x_1 \\ x_2 \\ x_3
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