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diff --git a/257/CH4/EX4.21/example_4_21.sce b/257/CH4/EX4.21/example_4_21.sce
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+syms M1 X1 B1 K X2 M2 B2
+
+F=M1*X1*s^2 + B1*s*X1 + K*X1 + K1*(X1-X2)
+//M2*X2*s^2 + K1*(X2-X1)=0
+X2=X1*K1/(s^2*M2+K1)
+
+disp(X2/F,"X2/F = ")
+