Question 800374
31 = -7.543ln(x) + 92.205
similar to what you did
7.543ln(x) =  92.205 - 31
7.543ln(x) =  61.205
however, here you should:
ln(x) = {{{61.205/7.543}}}
ln(x) = 8.114
find the antilog of both sides
x = {{{e^8.114}}}
x =  3340.9 ~ pretty close to what you have