CREATE TABLE table_203_739 (id DECIMAL, "rank" DECIMAL, "nation" TEXT, "gold" DECIMAL, "silver" DECIMAL, "bronze" DECIMAL, "total" DECIMAL)

how many more more bronze medals did russia earn than china ?
SELECT (SELECT "bronze" FROM table_203_739 WHERE "nation" = 'russia') - (SELECT "bronze" FROM table_203_739 WHERE "nation" = 'china')
SELECT (SELECT "bronze" FROM "table_203_739" WHERE "nation" = 'russia') - (SELECT "bronze" FROM "table_203_739" WHERE "nation" = 'china')