Given the following matrix A, find an invertible matrix U so that A is equal to UR, when R is the reduced row-echelon form of A:
The matrix A is a 3*5 matrix where the first row is (3, 6, 9, 12, 33) the second row is (-1, 1, 6, -1, 1,) and the third row is (-1, 1, 6, -1, 1,).
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