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diff --git a/257/CH5/EX5.20/example_5_20.sce b/257/CH5/EX5.20/example_5_20.sce
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+syms M2 K2 M1 K1 B
+s=%s
+
+a=(K2/s)+B
+b=(1/(M1*s))/(1+((1/(M1*s)*(K1/s) )))
+//shifting summing point S2 before 1/m2*s and interchange positions of S1 and S2 using associative law
+c=(1/M2*s)*a
+d=c/(1+c)
+e=d*b
+f=e/(1+(e*M2*s))
+Y=f*(1/s)
+
+disp(Y," Y/R = ") \ No newline at end of file