We must start from A trik mail extraction. (D-l-u), which is the diagonal matrix d l is a lower triangular matrix u is an upper triangular matrix, we will have a new equation is (d-l-u) x = b.
We have to start from the separation matrix A into (d-l-u), which D is diagonal matrix L is lower triangular matrix U is upper triangular. We have a new equation is matrix (d-l-u) x = B .