how can we determine the phase voltage of a balanced triangle three-phase source when impedances are present in that source and knowing the line voltage?

When we only have voltage sources, the line voltage gives us the value immediately, then we can proceed to transforming from triangle to star and solve the circuit, but I don't know how to proceed in my case.

Here's an image of the circuit (I used resistances as impedances), consider R1 = R2 = R3:

Thank you!

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