In Problem, use elementary row operations to transform each augmented coefficient matrix to echelon form. Then solve the system by back substitution.
3x1 + 4x2 − x3 − 2x4 + 2x5 = 6
3x1 + 3x2 + 2x3 − 7x4 + 3x5 = 9
2x1 + 8x2 − 7x3 + 6x4 + x5 = 4
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