Hello, I am a beginner user of Mathematica. I want to solve the following system of two nonlinear equations in term of m and R to find the equilibrium values of them.

For this purpose, I write these equation in the following forms in Mathematica:

mu[m_, r_] := (15 b^2 m^2)/(16 a^2 r^2 - 32 a r v + 16 v^2) + (
  15 b^2 m^2)/(16 a^2 r^2) + (30 b^2 m n)/(
  16 a^2 r^2 - 32 a r v + 16 v^2) - (15 b^2 n^2)/(
  16 a^2 r^2 - 32 a r v + 16 v^2) - (2 b (n - m))/(v - a r) + (
  2 b m)/(a r) + Log[v - a r] - Log[a r] - Log[n - m] + Log[m]

and

pi[m_, r_] := 
 m/(a*r) + (b*m^2)/(a^2*r^2) + (5*b^2*m^3)/(8*a^3*r^3) + (d*r0^2)/(a*
     r^2) - (d*r)/(a*r0) + (f)/(a*r^3) - (n - m)/(v - a*r) - (b*
     n^2)/(v^2 - (2*v*a*r) + (a^2*r^2)) + (2*b*n*
     m)/(v^2 - (2*v*a*r) + (a^2*r^2)) - (b*
     m^2)/(v^2 - (2*v*a*r) + (a^2*r^2)) - (5*b^2*
     n^3)/((8*v^3) - (24*v^2*a*r) + (24 v*a^2*r^2) - (8*a^3*
       r^3)) + (15*b^2*n^2*
     m)/((8*v^3) - (24*v^2*a*r) + (24 v*a^2*r^2) - (8*a^3*r^3)) - (15*
     b^2*n*m^2)/((8*v^3) - (24*v^2*a*r) + (24 v*a^2*r^2) - (8*a^3*
       r^3)) + (5*b^2*
     m^3)/((8*v^3) - (24*v^2*a*r) + (24 v*a^2*r^2) - (8*a^3*r^3))

all the symbols except m and R are constants. I tried to use Reduce function for this purpose but I receive the following error:

Reduce::nsmet: This system cannot be solved with the methods available to Reduce.

I was wondering if anybody can give me some advice to solve this system. In particular, if I use numerical values instead of all constants, then I can solve the nonlinear system for m and r?