Question: In Problems 1922, reduce the given system to echelon form to find a single solution vector u such that the solution space is the set
In Problems 19–22, reduce the given system to echelon form to find a single solution vector u such that the solution space is the set of all scalar multiples of u.

x1 + 3x2 + 3x3 + 3x4 = 0 2x1 + 7x2 + 5x3 - X4 = 0 2x1 + 7x2 + 4x3 - 4x4 = 0
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