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+syms H1 H2 H3 G1 G2 G3 G4
+
+//shifting summing points before G1 and take off points after G4
+
+a= G1*G2/(1+(G1*G2*H1))
+b= G3*G4/(1+(G3*G4*H2))
+c=a*b
+Y= c/(1+(c*(H3/(G1*G4))))
+
+disp(Y,"C/R = ")
+