Consider the mechanism.

Step 1: 2A↽−−⇀B+C
2
A
↽
−
−
⇀
B
+
C
equilibrium
Step 2: B+D⟶E
B
+
D
⟶
E
slow
Overall: 2A+D⟶C+E
2
A
+
D
⟶
C
+
E

Determine the rate law for the overall reaction, where the overall rate constant is represented as .
k
.