neg Method
  Negates the XPRB expression. 
Namespace: BCL
Assembly: xprbdn (in xprbdn.dll) Version: 37.1.1.0
  XPRBprob prob = new XPRBprob("NewProb"); XPRBvar var = new XPRBvar("Variable"); XPRBexpr exp = new XPRBexpr(4.2*var + 3.6); ... exp = exp.neg(); 
