At their going-out-of-business sale, Bill's Bikes sold 42 bikes and had 54 left. Which equation could be used to find x, the number of bikes the store had originally?
A.
x - 54 = 42
B.
x - 42 = -54
C.
x + 54 = -42
D.
x + 42 = 54
A.
x - 54 = 42
B.
x - 42 = -54
C.
x + 54 = -42
D.
x + 42 = 54