General desolve and conditions questions

[Rich]

Thank you Han, that really clears things up! This is for a dx/dt = -x + 5 where x(0) = 3

Would the appropriate formatting be

desolve(diff(-x+5,[t x]) AND x(0)=3,x)

I get bad argument value error now. : (

Thank you Tim for #3! that worked perfectly.

//running to class now bbl