Using Kirchhoff's Laws to solve values for a given circuit diagram

Question

In the circuit in the attached image,

https://ibb.co/WFCMGdh

given that the voltage supplied to the circuit is 12V, and that R1=R2=1000 Ω, R3=R4=2200 Ω, How can I calculate the total equivalent resistance of the circuit and, using Kirchhoff's Laws, solve for the unknown currents passing through, and voltage drops in, each resistor?

Answer 1

I forgot to mention I2, which is not going through a resistor. Using KCL at node D: I in = I out,

I2 = I5 + I4 = 12mA + 2.85 mA = 14.85mA