how can i solve this equation?

i attached the equation and all parameters all known except (R) so i want to solve this to find (R). parameters are:

L as (landa)=0.05;
t=1;
u as (meu)=0.02;
Q as (teta)=30;
R0=0.0000345;
a as (alfa)=0.000069;

so equation terns to this :

((R/R0).^2)*(((log(R/R0))-0.5))+0.5-((L*a*cos(Q)/(6*u*(R0).^2))*t

and in other way , equation in like this:

((R/0.000345).^2*(((log(R/0.000345))-0.05-(0.05 * 0.000069*0.5/(6*0.02*(0.000345).^2)

please help me to solve this:

R must be like this 0<R<1

[John D'Errico]

Please learn to format your code as readable code. While you have written essentially no code, you did mange to make it all run into one single run-on paragraph.

The "{} Code" button was put there for a reason. I've fixed your question to allow it to be readable this once.

[koorosh hallauj]

thank you very much...I appreciate what you did for me

Answer 1

[John D'Errico]

help solve

The answer will probably be in the form of a Lambert W function.