instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: if 1 / ( x + 4 ) + 1 / ( x - 4 ) = 1 / ( x - 4 ) , what is the value of x ?
answer:
4

question:
Problem: 1370 , x , 1070 , - 180 , - 6430
answer:
1320

question:
Problem: how many odd factors does 460 have ?
answer:
4