@staticmethod
def CleanupRightHandSide(s):
    """
        Remove spaces, leading +

        >>> EquationParser.CleanupRightHandSide(' +x')
        'x'

        :return: str
        """
    s = s.strip()
    if len(s) == 0:
        return s
    if s[0] == '+':
        s = s[1:]
    return s
