A crate containing 4 boxes of Sour Patch Kids weighs 8.4 kg. The crate, when empty, weighs 5.2 kg. Using x to represent the weight of one box, which equation could you use to determine the value of x?
A. 4x = 8.4
B. 5.2 - 8.4 = 4x
C. 4x + 5.2 = 8.4
D. 4(x + 8.4) = 5.2
