4. Read this problem carefully. Row reduce the matrix to reduced echelon form. Circle the pivot positions in the final matrix and in the original matrix, and list the pivot columns. 0 0 -3 12 4 5 2 1 -4 -8 5. Find the general solutions of the systems whose augmented matrices are given. 0 -4 2 3 -4 A = 1352 2 30 5 B = C = 2 -3 1 2 -2 2 227 2 3

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