Remember, the two constants going this way and this way are different times the concentration of z to the c coefficient or exponent times the concentration of w to the d power. Now this guy is equal to this guy because we're a dynamic equilibrium. And the only reason we are able to write the rate laws like this using the coefficients is because this is an elementary reaction. So now let's bring all the constant to one side and everything else the concentrations to this side. So we get the following. K one divided by k minus one equals this guy divided by this guy.