user: Question: Which Margin has a Winning score of –7 (71-72-67-71=281)?
Columns: ['Year', 'Championship', 'Winning score', 'Margin', 'Runner(s)-up']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1983.0, 'LPGA Championship', '–9 (68-71-74-66=279)', '2 strokes', 'Sandra Haynie']
SQL:

assistant: SELECT "Margin" FROM "Table" WHERE "Winning score" = '–7 (71-72-67-71=281)';