In Problem, use elementary row operations to transform each augmented coefficient matrix to echelon form. Then solve the system by back substitution.
3x1 − 6x2 + x3 + 13x4 = 15
3x1 − 6x2 + 3x3 + 21x4 = 21
2x1 − 4x2 + 5x3 + 24x4 = 23
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