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+//example no. 3.10
+//solve system by decomposition method
+
+A=[1 1 1;4 3 -1;3 5 3]
+n=3;
+
+b=[1;6;4]
+
+[U,L]=LandU(A,3)
+
+Z=fore(L,b)
+
+X=back(U,Z) \ No newline at end of file