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+//find system line voltage and string efficiency
+clear;
+clc;
+//soltion
+//given
+V2=20;//kV
+V3=30;//kV
+k=poly(0,"k");
+k=roots(V2*(1+3*k+k*k)-V3*(1+k));
+k=0.28;//Considering only positive part
+V1=V2/(1+k);
+V4=V1*(1+6*k+5*k^2+k^3);
+V=V1+V2+V3+V4;
+Se=V*100/(4*V4);
+printf("System line voltage(V)= %.3f kV \nString Efficiency= %.3f percent",sqrt(3)*V,Se);