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http://www.webassign.net/pse/p28-28.gif

Figure P28.28

My attempt to the problem:

I got the first following equations:

I1-I3-I2=0

I4+I6-I1=0

I2+I5-I6=0

I3-I4-I5=0

Note that I3 and I4 are currents flowing at the top

I2 and I6 are flowing through 3 and 5 ohm resistances

I1 is connected to a battery at tyhe left side of I2

Any help will be highly highly appreciated!!!