I=I1+I2
E1=I1·R1+I·(R3+R4)
E2=I·(R3+R4)+I2·R2
30=10·I1+30·I
50=30·I+20·I2
3=I1+3·I
5=3·I+2·I2
3=I1+3·(I1+I2)
5=3·(I1+I2)+2·I2
3=4·I1+3·I2
5=3·I1+5·I2
I1=0 A, I2=1 A I= 1A
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Verified answer
I=I1+I2
E1=I1·R1+I·(R3+R4)
E2=I·(R3+R4)+I2·R2
30=10·I1+30·I
50=30·I+20·I2
3=I1+3·I
5=3·I+2·I2
3=I1+3·(I1+I2)
5=3·(I1+I2)+2·I2
3=4·I1+3·I2
5=3·I1+5·I2
I1=0 A, I2=1 A I= 1A