Detailed Instructions: You are given a math word problem and you are supposed to apply a single mathematical operator like addition, subtraction, multiplication, or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
Problem:for halloween frank got 15 pounds of candy . if he gave 8 pounds to nancy what 's the difference between the pounds of frank 's candy before he gave nancy and he gave to ?
Solution:
7