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+//Ex14_3
+clc
+Rf = 10*10^3//feedback resistance
+R1 = 10*10^3//resistance 1
+R2 = 2*10^3//resistance 2
+v1 = 10//input voltage across resistance 1
+v2 = 4//input voltage across resistance 2
+//note: according to the given fig. in the textbook for the question we have:
+
+vo = -Rf*((v1/R1)+(v2/R2))//output voltage of adder circuit
+disp("Rf = "+string(Rf)+"ohm")
+disp("R1 = "+string(R1)+"ohm")
+disp("R2 = "+string(R2)+"ohm")
+disp("v1 = "+string(v1)+"V")
+disp("v2 = "+string(v2)+"V")
+disp("vo = -Rf*((v1/R1)+(v2/R2)) = "+string(vo)+"V")