In a letter dated November 7 , Zhou told Nehru that the LAC consisted of `` the so-called McMahon Line in the east and the line up to which each side exercises actual control in the west '' . In a letter dated 7 November 1959 Zhou told Nehru that the LAC consisted of `` the so-called McMahon Line in the east and the line up to which each side exercises actual control in the west '' .