-->exec('C:\Users\sangeet\Documents\Scilab\Circuits\Chapter 4\exa4.9.sce', -1)
 
 6*(i_1-5)+10*i_1+3*(i_1+4)-20=0   
 
 (6+10+3)*i_1=6*5-(3*4)+20   
 
 Current through the Upper Portion of the Supermesh(in Amps)=   
 
    2.