The task is to generate the correct answer for a given math problem.

Ex Input:
Problem: find the value of x : 2 x ² − 4 .

Ex Output:
- 2,2


Ex Input:
Problem: at a restaurant , glasses are stored in two different - sized boxes . one box contains 12 glasses , and the other contains 16 glasses . if the average number of glasses per box is 15 , and there are 16 more of the larger boxes , what is the total number of glasses at the restaurant ? ( assume that all boxes are filled to capacity . )

Ex Output:
48


Ex Input:
Problem: 49 × 49 × 49 × 49 = 7 ?

Ex Output:

8