XPRBexprMultiply(XPRBexpr, Double) Operator

public static XPRBexpr operator *(
	XPRBexpr l,
	double d
)

Public Shared Operator * ( 
	l As XPRBexpr,
	d As Double
) As XPRBexpr

XPRBvar var = new XPRBvar("Variable1");
XPRBvar var2 = new XPRBvar("Variable2");
XPRBexpr exp = new XPRBexpr(var + 3.6*var2);
XPRBexpr expnew;
...
expnew = exp*3.14159;