Forcing matlab to simplify symbolic expression

How do I get matlab to simplify this answer in the script?

c = 3e8; 
h = 6.626e-34; 
k = 1.38e-23;

syms l T
eqn = exp((h*c)/(l * k * T)) * (((h*c)/(l * k * T)) -5) + 5 == 0;
lmax = solve(eqn, l)

lmax =

2886030032919217/(200358257643048576*T*(lambertw(0, -5*exp(-5)) + 5))

I can take out the symbolic variable "T" within the lmax answer and matlab easily calculates a simple answer. What gives?

Answer 1

[Star Strider]

Use the vpa function:

lmax = vpa(solve(eqn, l))

produces:

lmax =
0.0029011110628620153129357555503486/T

It is not possible to use vpasolve in this expression. The vpa function must be called separately.

[noMathWiz]

Thank you!

[Star Strider]

As always, my pleasure!