HOW TO SOLVE SYSTEM OF COMPLEX EQUATIONS?

I declared R and K as:

syms R K,

where R and K are "unknown complex numbers".

Then I did some calculations and eventually got the following value in the variables sum1 and sum2:

sum1 = - 17034620680878987/(34359738368*(R + K*i)^2*(3/(R + K*i) + 14641/250)) + 5678206893626329/(34359738368*(R + K*i))

sum2 = also function of R and K

(sum1 and sum2 are functions of R and K).

I want to solve a system of equations:

sum1 = "some known complex number" (eg 5 + 9i)

sum2 = "also known complex number" (eg 3 - 8i)

and to find R and K.

I tried to disassemble it into the real and imaginary part and with the help of function it solved but it couldn't.