CREATE TABLE table_name_54 (circuit VARCHAR(255), team VARCHAR(255), city___state VARCHAR(255))
What is Circuit, when Team is "R.J.MacArthur Onslow", and when City / State is "Sydney , New South Wales"?
    
SQL: SELECT circuit FROM table_name_54 WHERE team = "r.j.macarthur onslow" AND city___state = "sydney , new south wales"