Quesrions on BODMAS

If -: stands for xx, xx stands for -,- stands for + and + stands for -: then 48+6-12-:2+10=? (Do chronologically and not according to BODMAS rule)

If 'R' stands for -, 'A' stands for '+', 'B' stands for ' -: ' and 'C' stands for ' xx ', then what is the value, of the given equation? (BODMAS rule will not be applicable) 25 A 37 C 2 B 4 R 1= ?

If 'R' stands for '-', 'A' stands for '+', 'B' stands for '-:' and 'C' stands for 'xx' , then what is the value, of the given equation? (BODMAS rule will not be applicable) 25 A 37 C 2 B4R1=?