[CRASH] plotfunc() fails

[parisse]

Can you write your equations in plain text instead of a screenshot?
Like this
P:=7000000.; R:=8.314; T:=423.15; Tc:=369.8; Pc:=41.9*101325;
a:=27*R^2*Tc^2/64/Pc; b:=R*Tc/8/Pc;
plotfunc(R*T/(x-b)-a/x^2-P)
It's much more efficient, because anyone can check quickly by doing a copy/paste, and you are certain we check with the right data.
I just checked on the emulator, it works.