There are many different ways to stabilize, from touching objects to simply exclaiming "stability now". I fail to see how algebra would help. As for sitting down, try and focus attention on the physical sensation of the chair. When you look at your fingers, try and force them to focus if they appear blurry. When touching objects, make sure you feel the texture. Basically, the idea of stabilization is to engross yourself in the dream as much as possible, without losing awareness.