18=3*I1+3*I2, I2=6-I1,
9= 3*I2-9*I3, I3=I2/3-1= 2-I1/3-1= 1-I1/3,
I1=6-I1+1-I1/3, 7/3*I1=7, I1= 3A,
I2=3A, I3=0A
18=3*I1+3*I2, I2=6-I1,
9= 3*I2-9*I3, I3=I2/3-1= 2-I1/3-1= 1-I1/3,
I1=6-I1+1-I1/3, 7/3*I1=7, I1= 3A,
I2=3A, I3=0A