CREATE TABLE table_8598 ("Club" TEXT, "Played" TEXT, "Drawn" TEXT, "Lost" TEXT, "Points for" TEXT, "Points against" TEXT, "Points difference" TEXT, "Points" TEXT)

When there were 767 points, what was the point difference?
SELECT "Points difference" FROM table_8598 WHERE "Points against" = '767'
SELECT "Points difference" FROM "table_8598" WHERE "Points against" = '767'