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+//problem 20 pagenumber 2.103
+//given
+v1=2;//volt
+v2=3;//volt
+v3=6;//volt
+v4=8;//volt
+rf1=50e3;//ohm
+r1=40e3;//ohm
+r2=25e3;//ohm
+r3=10e3;//ohm
+r4=20e3;//ohm
+r5=30e3;//ohm
+//determine output voltage
+v0x=-(v1*rf1/r1)-(v2*rf1/r2);format(5);
+req=r5*r4/(r5+r4);//combination of r4 and r5
+re1=(r3*r5)/(r3+r5);//combination of r3 and r5
+vn=req*v3/(r3+req)+(re1*v4/(r4+re1));
+v0y=(1+rf1/(r1*r2/(r1+r2)))*vn;
+disp('Output voltage = '+string(v0x+v0y)+' V');