Thank you. That’s what I thought, since the Newton ‘prime’ notation implies derivatives of time.
It would also be nice to know if ‘x’ is a function of time (or anything else) or is simply a value. If it is a funciton of time, integrating the differential equation symbolically may not be possible (at least in a closed form, since the RHS would have to be integrated separately, then substituted back into the integrated LHS). That would slightly complicate things.
With what I currently know about this, it can just be plugged into the demonstration code I cited to in my original Answer to produce —
You can also select a web site from the following list
How to Get Best Site Performance
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.