Why the right(); command returns both sides of an expression? (SOLVED!)

[Spybot]

Hi Guys!

I have this code:

EXPORT TEST()
BEGIN
LOCAL M,BY,S,y,x;
INPUT(M,"Title","Label:");
BY:=CAS.y=M*CAS.x;
S:=CAS.right(BY);
MSGBOX(S);
END;

I'm trying to extract the right side of this expression (y=3x), using the right(); command, let's say I set M=3 ... then I expect to get: 3*x(no list format), but what I get is a list containing both sides of the equation. {y, 3*x}

Any Idea?

Spybot,