So all I did to go from this step right over here, which I set up saying, hey, this is the expected value of one roll, which we already know to be 3.37, is I just multiplied both sides of this equation by 500. I just did this times 500, and I did this times, I did this times 500, and this 500 obviously cancels with all of these, and then 500 times 3.37 is 1685, and so I got this right over here. Now, I got one, two, three, four, five, six, yep, I did enough, I have the right number of terms. I just want to make sure I'm not making a careless mistake, and so if we want to simplify this, we can subtract 220, 285, 280, and 375 from both sides, and so we would be, if we did that, we would get A, if we subtract that from the left-hand side, we're just going to get A plus 6B, and on the right-hand side, we are going to get, let's get our calculator out, 1,685 minus 220, 220 minus 285, minus 285, minus 280, minus 280, minus 375, minus 375 gets us to 525. So we get A plus 6B is equal to 525, and you say, okay, you did all that work, but we still have one equation with two unknowns. How do we figure out what A and B, how do we figure out what A and B actually are? Well, we know something else.