Need help with solve&fsolve with stored equations

[alexzkter]

As the title says, I'm having a hard time in the attempt of solving stored equations (on Apps).

The equation is P=((R*T)/(x-b))-(a/x^2)

Here's the definition of the needed variables on CAS:


In order to store the 3 equations on a Solve app, (a,b and P equations) I also need to define the 'v' as v:=0 so I don't get syntaxis error:


fsolve and solve are working if v is an undefined variable. But if I create this variable, I can't solve the equation anymore (fsolve and solve shows [] )


Then...how am I supposed to easily type in solve() on CAS and then copy-paste the expression from Solve app or such ???

Thanks in advance