So we simply rearrange this equation and we get this. Now this is the quantity that we defined previously as the K and the Mcales constant. So we said that the Michael is constant is equal to this ratio here. And so now we replace this with the Maclus constant and that is equal to this entire quantity here. And finally, if we take this and we rearrange it and solve for the Es concentration, we bring this here and Km to the bottom, we get the following equation. Let's call this equation two.