Carl is boarding a plane. He has 2 checked bags of equal weight and a backpack that weighs 4 kg. The total weight of Carl's baggage is 35 kg. Write an equation to determine the weight, w, of each of Carl's checked bags. Find the weight of each of his checked bags.
A) w = 15.5 kg
B) w = 12.5 kg
C) w = 11.5 kg
D) w = 10.5 kg