Table: t_1974_mens_volleyball
Columns: date
score
set_1
set_2
set_3
total

Question: What was the Set 1 game score when Set 3 game score was 15–4, and a Set 2 game score was 15–7?
SQL: SELECT "set_1" FROM t_1974_mens_volleyball WHERE "set_3" = '15–4' AND "set_2" = '15–7'