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+//CHAPTER 1- D.C. CIRCUIT ANALYSIS AND NETWORK THEOREMS 
+//Example 18
+
+disp("CHAPTER 1");
+disp("EXAMPLE 18");
+
+//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
+I2=0;                           //since mesh 2 is open
+I1=v-I2;
+I3=I1/6;                        //from the equation
+vth=-(r2*I3)+v;
+r=r1+r5;
+rth=(r*r4)/(r+r4);
+I=vth/(rth+r3);
+vx=-I*r3; 
+disp(sprintf("By Thevenin Theorem, the value of V_x is %d V",vx));
+
+//END