Hi! Basically you have to look for the numbers 1 2 and 3 in symbols that can be found in different areas. Each of these numbers will be in a shape with a certain amount of sides, then you replace the number on the equation with the number of sides on the shape! SPOILERS BELOW:
Those numbers can be found in the Lab Room (replace "1" with the number 12), Morgue (replace "2" with the number 1) and the Refrigerator Room (replace "3" with the number 6). Then you just add and subtract like the equation on the cabinet said! Hope this helps! :)
yeah the problem now is that i got all the numbers and when i added and subtracted it i got a 1 and it didnt work, im out of ideas my king was a 11 when i counted it all but i also multiplied 8x3 to get 24 my pawn was 5, and my queen was 41- rookie: 28 bishop was 16 and knight was 25 idk what to do, im not good at puzzles sorry😔