Step-by-step explanation
If a person uses Redbox then we have the following cases:
- A: the person uses only Redbox
- B: the person uses only Redbox and Netflix
- C: the person uses only Redbox and a video store.
- D: the person uses Redbox, Netflix and a video store.
There are 52 people in case A, 44 people in case B, 19 people in case C and 15 in case D. Then the total amount of people that use Redbox is given by the sum of all these numbers:

Answer
Then the answer is 130 people.