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+//Chapter 3, Example 3.7
+clc
+//Initialisation
+v1=50                          //voltage
+v2=15                          //voltage
+v3=100                          //voltage
+r1=10                         //resistance in ohm
+r2=20                        //resistance in ohm
+r3=30                        //resistance in ohm
+r4=25                        //resistance in ohm
+
+//Calculation
+//by making a two linear equations, and solving them by matrix method
+a=[(-13/60) (1/20);(1/60) (-9/100)]
+b=[-5;(-100/30)]
+x=a\b
+I1=x(2)/25              //current in ampere
+
+//Results
+printf("Current, I1 = %.1f A",I1)