Matlab : looking for a numerical or symbolic expression of single unkonwn in a system of 4 equations

In MATLAB, I have a system of 4 symbolic equations, actually these come from the equality between 2 matrixes 2x2. I have only one unknown which appears multiple times in the system of equations The system seems to be solved but I don't know how to get a numerical value of this unknown or maybe a simple symbolic expression of it. This is due I think to conditions on the solution. Everything is summurazed on : [login to view URL] This is a personal project.