It took Harry three years to collect 14,312 baseball cards. And the first year he collected 7,815 cards, and in the second year he collected 5,528 cards. Which equation can be used to find x, the number of cards Harry collected in the third year?
X= 14,312 - 7,815 - 5,528
X= 14,312 + 7,815 + 5,528
X= 7,815 + 5,528
X= 7,815 + 5,528