XPRBexprAddition(XPRBexpr, XPRBvar) Operator

public static XPRBexpr operator +(
	XPRBexpr l1,
	XPRBvar v
)

Public Shared Operator + ( 
	l1 As XPRBexpr,
	v As XPRBvar
) As XPRBexpr

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