So we say the concentration of enzyme substrate complex multiplied by K minus one and we add it to this reaction. So the concentration of the enzyme substrate complex multiplied by K cat this quantity here. Now notice on the right side this, and this appears in these two terms. And so we can bring that out of our equation. And then we get K minus one plus K cat multiplied by the concentration of Es. And so now if we solve for K minus one plus Kcat divided by K one, we get the following result.