Symbolic value propigation

Maybe that way:

There are sure other ways but you have to be more precise as to what you are really after at at the end.

Looks you have to solve a system of equations?

Next time please attach your worksheet, but as you are using Prime, you still have to provide a picture or a pdf printout because many of us (like me) cannot reat P3.1 files with our P.3.0 version of Prime.

WE

Yes, but not like that. The symbolic evaluation gives f''(0) as c2. The boolean equals and the 0 have no effect at all, they are just cosmetic, so c2 has not been assigned any value. The only way to assign a value to a variable is with a numeric assignment. That can be coupled with a symbolic operation, for example a solve, but in your case I can't tell you exactly what to do without seeing more of the worksheet.

I've attached a simplified example of my question. If I want to use "x" later in my worksheet I have to redefine it after it's symbolically solved.

If my "y" or "w" variables change, the new value for "x" is no longer propagated.

Is there a technique that would keep me from refining "x" every time is value is effected?

*I'd add an attachment of the original file but am not seeing an option to do that, what am I missing?

Perhaps you could use this general solution to your original post:

Or, if w & L are previously defined, you could use this case-specific form instead: