What team have been promoted Serbian League East the same season when Kolubara have been promoted Serbian League Belgrade?
Season Serbian League Belgrade Serbian League East Serbian League Vojvodina Serbian League West
text text text text text
1-12283621-6
2006–07 Hajduk Beograd Jagodina Novi Sad Metalac G. Milanovac
2007–08 Kolubara Dinamo Vranje Spartak Subotica Inđija Mladi Radnik
2008–09 Zemun Teleoptik Radnički Niš Proleter Novi Sad Radnički Sombor Sloga Kraljevo
2009–10 BASK Sinđelić Niš Big Bull Radnički Radnički 1923
2010–11 OFK Mladenovac Radnički Niš Donji Srem Sloga Kraljevo
2011–12 Voždovac Timok Radnički N. Pazova Jedinstvo Užice
table_12283621_6
SELECT Serbian League East FROM table WHERE Serbian League Belgrade = Kolubara
Kolubara