In Problem, use elementary row operations to transform each augmented coefficient matrix to echelon form. Then solve the system by back substitution.
3x1 + x2 + x3 + 6x4 = 14
x1 − 2x2 + 5x3 − 5x4 = −7
4x1 + x2 + 2x3 + 7x4 = 17
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