If P of S equal to s -, 1 / s -, A and P of two equal -3, what's the value for a? So once again, remember P of two equaling -3 is really really a point. It's saying the input is to the output is -3. So this is our input. In this case, it's our S value. Our -3 is going to equal 2 * 2 - 1 / 2 -, a so -3 * 2 -. A equal 4 - 1 is three. We could divide each side by negative three 3 / -3 is -1, subtract the two to the other side and divide by a negative. There are a lot of different ways to do this. We could have distributed back here if we wanted to, and then added the six and then divided by three.