The purpose of this circuit (taken from the Minimoog) is to provide a stable -5V across the 100R load resistor, as accurate as the -10V supply and the ratio of the 5K resistors in the potential divider, and capable of sinking tens of mA. As I understand it, the transistor is configured as an emitter follower, and negative feedback around the op-amp ensures that the remotely sensed load voltage matches the reference voltage.
I think the circuit would continue to work if either or both of the 4.7k resistors shown were replaced by wires. Why were they included, and what effect do they have on the performance of the circuit?
For R5, I would suggest that it helps to match the offset voltage [caused by the op-amp's input bias current] at the two inputs of the op-amp, but I'm puzzled because the potential divider has a Thevenin equivalent circuit that is -5V in series with 2.5k, so a better value for R5 would be (say) 2.2k.