[BASIC HELP] CAS.fsolve problem [Solved]

[Ziz]

Hello,

I'm trying to do a little program to solve an equation but the fsolve returns an error.

Pws(T)
BEGIN
T:=T+273.15;
LOCAL C1,C2,C3,C4,C5,C6,C7;
LOCAL Ps,P;

C1:=-5.6745359*10^3;
C2 := 6.3925247*10;
C3 := −9.6778430/10^(3);
C4 := 6.2215701/10^(7);
C5 := 2.0747825/10^(9);
C6 := −9.4840240/10^(13);
C7 := 4.1635019*10;
Ps:=CAS.fsolve(C1/T+C2+C3*T+C4*T^2+C5*T^3+C6*T^4+C7*ln(T)=ln(P),P,1000);
PRINT("Ps="+Ps);
RETURN Ps;
END;