“Let’s say you want to lose weight by exercise. You burn 3,000 calories, which are really kilocalories, in one exercise session. But you eat food ...ontaining 4,000 calories after the session because it made you hungrier. Your partial derivative of weight over exercise is the negative of whatever weight 3,000 calories represents. Your partial derivative of food intake with respect to exercise is 4,000 calories.“Well, that situation, while not continuous and, thus, not really dealt with by. I hesitated for a moment but then bent down and gave myself a couple more rubs before I stepped back into my trousers and pulled them up and carefully did up the fly over my erection. The feeling of not wearing any underwear was lovely, and I adjusted the position of my penis so that it was standing up to my belt.Sneaking out of school without being noticed I walked down towards the park. I put my hand in my trouser pocket and stroked my cock as I continued walking. When I got to the Park there. More

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