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How to solve this (nonlinear?) equation in Matlab

How to solve this (nonlinear?) equation in Matlab

How to solve this (nonlinear?) equation in Matlab

(OP)
Hi,
Could you help me find solution (L) of below equation in Matlab:

L=((gT^2)*tanh(2*pi*d/L))/(2pi)

T,g,d are given
L = ?
You can find L on both sites of equation.So it seems me it has to be solved by iteration.
What function is used in Matlab to solve such equations?

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