Transfrom scheme into eq. scheme with one EMF and one resistor.

[gneill]

Yes. Be sure that you pay attention to the polarity of the voltage source. Remember that you found a negative value for E, making point a negative with respect to b.

 

[builder_user]

Remember that you found a negative value for E, making point a negative with respect to b.

I need to change the direction of E?
But E>0 because I3>0 & R3>0.

One of the tasks is done(I don't sure in this tense form)(another task is node potential method(only 2 nodes in the circuit so I try to make on my own(with rare success)).Thanks for your help.