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: a house wife saved $ 5 in buying an item on sale . if she spent $ 48 for the item , approximately how much percent she saved in the transaction ?

Answer: 10 %


Question: Problem: if x ^ 2 + 9 / x ^ 2 = 10 , what is the value of x - 3 / x

Answer:
2