Order of muliplication with or without times sign [duplicate]

Is 6:2(2+1)=1 or is 6:2(2+1)=9 ? I can't find any information regarding the order of multiplication without a sign. I'm sure that 6:2*(2+1) is 9, but I'm not sure about this.

• See also this recent question. – Arthur May 17 '17 at 16:40
• Is $:$ supposed to be $\div$? – tilper May 17 '17 at 18:41