XPRBvarSubtraction(XPRBvar, Double) Operator

public static XPRBexpr operator -(
	XPRBvar v1,
	double d2
)

Public Shared Operator - ( 
	v1 As XPRBvar,
	d2 As Double
) As XPRBexpr

XPRBvar var = new XPRBvar("Variable1");
XPRBexpr exp;
...
exp = var-9.6;