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+//CHAPTER 1- D.C. CIRCUIT ANALYSIS AND NETWORK THEOREMS 
+//Example 17
+
+disp("CHAPTER 1");
+disp("EXAMPLE 17");
+
+//VARIABLE INITIALIZATION
+v=7;                            //voltage source in Volts
+I=7;                            //current source in Amperes
+r1=1;                           //in Ohms
+r2=2;                           //in Ohms
+r3=1;                           //in Ohms
+r4=2;                           //in Ohms
+r5=3;                           //in Ohms
+
+//SOLUTION
+
+//deactivating the current source
+res=(v/4)+(v/2);
+vc=res/((1/4)+(1/r1)+(1/r2));
+vx1=-vc;
+
+//deactivating voltage source
+//(4)va+(-1)vb=-21........eq (1)
+//(2)va+(-11)vb=0.........eq (2)
+//solving the equations by matrix method
+A=[4 -1;2 -11];
+b=[-21;0];
+x=inv(A)*b;
+va=x(1,:);                       //to access 1st element of 2X1 matrix
+vb=x(2,:);                       //to access 2nd element of 2X1 matrix
+vx2=-vb;
+vx=vx1+vx2;
+disp(sprintf("By Superposition Theorem, the value of V_x is %d V",vx));
+
+//END