Actually, let me make it a little bit clearer. V of 3 is equal to 3 plus C, and they tell us that that's equal to negative 3. That is equal to negative 3. What's C going to be? If we just look at this part of the equation, just this equation right over here, if you subtract 3 from both sides, you get C is equal to negative 6. Now we know the exact expression that defines velocity as a function of time. V of T is equal to T, T plus negative 6, or T minus 6.