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