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+//Example 7.13
+//Diffrentiation property is used here
+clc;
+syms n z;
+x1=((-1/2)^n);
+x2=(1/4)^-n;
+X1=symsum(x1*(z^-n),n,0,%inf);
+X3=(-z)*diff(X1,z);
+X2=symsum(x2*(z^-n),n,-%inf,0);
+X=X3*X2;
+disp(X,'X(z)=');
+\ No newline at end of file