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

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

Output: - 2,2


Input: Consider Input: Problem: two tains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post . if the length of each train be 120 metres , in what time ( in seconds ) will they cross each other travelling in opposite direction ?

Output: 12


Input: Consider Input: Problem: 11 + 12 + 13 + . . . 51 + 52 = ?


Output: 1323