[BUG]
>> -5*(-1)/6+1/4
in> -5*(-1)/6+1/4
out> 13|12
------------------------
>> -5*(-1)|(6)+1/4
in> -5*(-1)|(6)+1/4
out> 21|4
------------------------
>> -5*(-1)/6+1/4
in> -5*(-1)/6+1/4
out> 13|12
------------------------
>> -5*(-1)|(6)+1/4
in> -5*(-1)|(6)+1/4
out> 21|4
------------------------