The T's cancel and negative times a negative gives us a positive, and this quantity becomes negative T multiplied by delta S universe. So we can rearrange this equation, basically bring this to that side, and we get the following equation. Let's call this equation four. So the negative of the temperature in Kelvins multiplied by the change in entropy of the universe is equal to the change in entropy of the system. So basically, how much energy was exchanged between the system and the surroundings minus the temperature multiplied by the delta S of the system. So let's call this equation four.