If You can explain your problem, I can help You.
You need to see the relationships in the first two triangles based on all three (especially the third). Then, click on the appropriate number on the "keyboard" according to the formula (x, y). When you click the first number, the scene will change to one with the same puzzle, but with a different keyboard layout and time-rewinding will swing, and then click on the appropriate number, which is called "y" in the puzzle.