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diff --git a/104/CH3/EX3.7/3_7.sce b/104/CH3/EX3.7/3_7.sce
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+//block diagram is converted to SFG
+//mason's gain formula applied to SFG in figure 3-17
+//E as output node
+syms G1 G2 G3 G4 H1 H2 
+M1=1
+L11=-G1*G2*H1
+L21=-G2*G3*H2
+L31=-G1*G2*G3
+L41=-G1*G4
+L51=-G4*H2
+delta=1-(L11+L21+L31+L41+L51)
+delta1=1-(L21+L51+L11)
+x=M1*delta1/delta
+disp(x,"E(s)/R(s)=")
+//Y as output node
+M1=G1*G2*G3
+M2=G1*G4
+delta1=1
+delta2=1
+y=(M1*delta1+M2*delta2)/delta
+disp(y,"Y(s)/R(s)=")
+\ No newline at end of file