6. Solve the equation \( A X=b \) by using the \( L U \) factorization (a) \( A=\left[\begin{array}{ccc}3 & -7 & -2 \\ -3 & 5 & 1 \\ 6 & -4 & 0\end{array}\right], \quad b=\left[\begin{array}{c}-7 \\ 5 \\ 2\end{array}\right] \)
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