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diff --git a/162/CH6/EX6.5/example65.sce b/162/CH6/EX6.5/example65.sce
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+++ b/162/CH6/EX6.5/example65.sce
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+//Example 6.5
+clc;
+syms z n;
+x1=4*(5^n);
+x2=3*(4^n);
+X1=symsum(x1*(z^-n),n,0,%inf);
+X2=symsum(x2*(z^-n),n,0,%inf);
+X=X1-X2;
+\ No newline at end of file