Amaya's height is 2 inches less than 2/5 the depth of the pool, d. If Amaya is 52 inches tall, how many inches deep is the pool?

I'm confused. I just need an equation in order to do this

Let D= depth of the pool in inches

Amaya's height in inches = (2/5)D - 2 inches
From the problem, Amaya's height is 52 inches.
52 inches = (2/5)D - 2 inches

I really don't know i need help too because my math math assessmnet test is tomorrow.