And so in this particular case, we actually have to leave the equation as it is. Now we want to use equation seven to basically replace this quantity in terms of the total amount of enzyme and the enzyme substrate concentration. And so what we want to do is we want to use equation seven and solve for this quantity here. Remember, in this case, because of what we did in equation six, this is simply this here. This does not change, but we want to change e and replace it with something that contains Es. And so we take equation seven, we rearrange equation seven and solve for this.