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diff --git a/257/CH5/EX5.7/example_5_7.sce b/257/CH5/EX5.7/example_5_7.sce
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+syms G1 G2 G3 H1 H2 H3
+
+a= G3/(1+G3*H1*H2) //feedback
+b=G2*a/(1+(G2*a))
+c=G1*b
+Y=c/(1+c*H1*H2*H3)
+
+disp(Y,"C/R = ")