w=93 log10 d +65 convert to exponential form
w=93 log10 d +65
Subtract 65 from both sides and divide the result by 93
(w - 65)/93 = log10d (I've assumed you mean the 10 to indicate it is log to the base 10)
Raise both sides to the power 10:
d = 10^[(w-65)/93]
Thank you
