Heuristic solver for lambert W function?

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Ian
Ian 2012-9-5
I have a function in the form of, x*(2^x)=b/ln(2)
This can be expressed as x=W(b)/ln(2), where, W is the product log function (or lambert W function) (reference: http://en.wikipedia.org/wiki/Lambert_W_function)
Is there any way to solve for 'x' given the value of 'b'? Is there a heuristic solver/algorithm that can help?
Much thanks ian

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Matt Fig
Matt Fig 2012-9-5
编辑：Matt Fig 2012-9-5
X = solve('x*(2^x)=b/ln(2)','x');
x_b3 = subs(X,'b',3) % x when b=3

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