(1) Find A = LU, where L is a unit lower trian- gular matrix and U is an upper triangular matrix (by type 3 row operations only, must). (2) Solve Ax = b by two-step substitutions. 2 1 0 1 -2 -2 2 -1 A = 2 b = 1 3 3 1 1 5 6 6.

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