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clear,clc
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A=[1 1 0 3;
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2 1 -1 1;
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3 -1 -1 2;
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-1 2 3 -1]
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[L1,U1]=lu_decompose(A)
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B=[8;7;14;-7]
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V=inv(L1)*B
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X=inv(U1)*V
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