CREATE TABLE table_23284271_7 (team VARCHAR, score VARCHAR)

How many teams played against the Mavericks in a game where the score was w 99 91 (ot)?
SELECT COUNT(team) FROM table_23284271_7 WHERE score = "W 99–91 (OT)"
SELECT COUNT("team") FROM "table_23284271_7" WHERE "W 99–91 (OT)" = "score"