Hi all - I suspect this is a dumb noob question but after browsing the
tutorial and other docs, I can't get this to work,

from sympy import symbols, solve

x = symbols('x')
f_x = (((2/x + x_max) * (1-exp(x*x_max)) + 2*x_max*exp(x*x_max)) / (exp
(x*x_max) - 1 - x*x_max)) - x_mean
solutions = solve(f_x, x)

...I get the error, ValueError: Symbolic value, can't compute for the
f_x line.  x_max, x_mean are supplied parameters (constants, in f_x).

Any help appreciated!

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