So this becomes this. Now, step three remember when we talk about Gibbs free energy, we talk about a reversible reaction. And because enthalpy is a state function, according to Hess's law, hess's law states that the entropy change of the forward reaction is equal to the negative entropy change of the reverse reaction. So the amount of energy that leaves the system is the same amount of energy, except negative that into the system. Okay? So the magnitude remains the same, but the signs change.