Hey,
See these two examples:
If the value of a parameter is unavailable, then you can use solve function with syms variables, which will give you solution in terms of the parameters. See this example: in.mathworks.com/help/symbolic/examples/solve-equations-in-returnconditions-mode.html#responsive_offcanvas . This method is really cool but might not work with complex equations. In that case MATLAB gives you solutions using the above mentioned vpasolve function.
This example uses Symbolic Math Toolbox, which solves equations symbolicaly (the same way we differentiate/integrate functions on our notebooks to get derivative/integral function in terms of variables).
