Problem with equation in Programming

[nakjaen]

Hi guys i have a problem with a program, i need solve a 3grade equation, i input the code but i dont have the solution
When i solve in home window i have the solution, why?

code:

Code:

EXPORT prueba1()
BEGIN
LOCAL d,ar,So,t,S;
LOCAL E,A,Tc;

A:=123;
d:=20;
t:=30;
S:=356;
E:=234;
ar:=98;
So:=342;

Tc:=CAS.solve("A=d*(15-t)*S*E-x+(((ar^2)*So^2)*S*E)/(24*x^2)","x");
MSGBOX(" solution" +(Tc));

END;

programming:
   

home window: