Hello, can anyone help me with this task?

I’ve been cracking my head with this question for a while now and got nowhere, so any help would be appreciated! -The squared boxes are basically the resistors, the R_last is just the load resistor -The circle represents the voltage source! -Given are the values of Uq(voltage source), R_1, R_2 , R_3, R_4. And the values searched are the load current, load voltage and the load resistance.

Initially I thought we could use Thevinen’s theorem, but that doesn’t get me too far…