So five B is equal to 375, or if we divide both sides by five, we get B is equal to, B is equal to 75. B is equal to 75. So this right over here is equal to 75. If B is equal to 75, what is A? Well, we know that A plus B is equal to 500. We figured that out a little while ago before we multiplied both sides of this times a negative one. We knew that A plus B, when B is now 75, so we could say A plus 75, is equal to 150.