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r1=10^3;
r2=2*10^3;
r3=3*10^3;
r4=4*10^3;
r5=5*10^3;
v1=10;
v2=20;
vr2=v1*r2/(r1+r2);
vr4=v2*r4/(r4+r5);
vth=vr4-vr2;
rth=r1*r2/(r1+r2)+r4*r5/(r4+r5);
i=vth/(rth+r3);
disp("the current (in mA) through R3 is"); disp(i*10^3);
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