user: Question: Who was the opponent before week 8 when the result was L 28-17?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 21, 1975', 'at Minnesota Vikings', 'L 27-17', 46479.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Week" < 8.0 AND "Result" = 'L 28-17';