the calculator sid the answer is, w=(ln((266/125))/ln(e))
which is a bit of a mouthful.
Rewrite the left-hand side of the equation.
2.128 = 266/125:
266/125 = e^μ w
Reverse the equality in 266/125 = e^μ w in order to isolate w to the left-hand side.
266/125 = e^μ w is equivalent to e^μ w = 266/125:
e^μ w = 266/125
Solve for w.
Divide both sides by e^μ:
w = (266 e^(-μ))/125