Solve for an implicitly defined variable

How do I use matlab to solve for an implicitly defined variable? For example

x=0.6953*ln(115/(215-x))-100

Answer 1

[Walter Roberson]

syms x
vpasolve(x==0.6953*log(115/(215-x))-100)

There is a second solution, which is approximately 215 - -2.02E-195 . However, you cannot round that to 215: if you do round it then you would get a division by 0.