Unfortunately, the browser used for posting questions is hopelessly inadequate for mathematics: it strips away most symbols. All that we can see is "... (x0 y 23 z-2)32 over (x2 z 12) -6". From that it is not at all clear what the missing symbols (operators) might be. It makes little sense for me to try and guess - I may as well make up my own questions and answer them!
13+-12--5 = 6
6
13 - 12 - (-5) 1 - (-5) 1 + 5 6
19/12
6
12 / 4 = 3
It is 5 over 12.
1 over 3
No, you can't simplify because it is in its simplest form.
Yes, you can. 12/1 simplified is 12.
The expression (12x + 36)/48x can be simplified by factoring out 12/12 from the expressions. This leaves (x + 3)/4x.
Yes - it simplifies to 15/12