def METHOD_NAME(self, id, name, size, description):
    """
    Add an unknown to the equation system.
    """
    if len(self.unknowns) > 0:
        offset = self.unknowns[-1].getNextOffset()
    else:
        offset = 0
    self.unknowns.append(DREAMEqsysUnknown(id=id, offset=offset, name=name, size=size, description=description))