Step-by-step solution

[ValeryOchkov]

[Werner_E]

You suggest that Prime should always make an even number of errors in its calculation so that they may cancel? 🙂

I really would appreciate if Prime would allow at least a manual stepwise treatment of an equation like other software has no problem to do.

Here the free GeoGebra

Second expression is done by typing #1+3. And of course all the other commercial CAS's like Mathematica or Maple are able to do so as well.

And here is Prime9

😞

Also badly missing symbolic functions which wold return the RHS or LHS of an equation.

[MartinHanak]

Mathcad Prime 9.0

[Werner_E]

The big drawback here is that you have to manually write the same operation on both sides which is failure prone. What would be needed is a way to write the desired operation only once to get it applied to both sides of the equation.
But Prime does not offer a way to handle parts of an equation or apply operations on equations.