Call the impedance given by the top part of the circuit Z₁ and the impedance given by the bottom part Z₂.

We see that Z₁ = 70 + 60j Ω and Z₂ = 40 − 25j Ω

So

(Adding complex numbers should be done in rectangular form.)

Now, convert all to polar form and then multiply and divide as follows:

So we conclude that the combined impedance is

Z_T = 37 - 5.9j Ω