Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

[EX Q]: a clown had 16 balloons . he gave 4 away at a party . how many balloons does he still have ?
[EX A]: 12

[EX Q]: the library has 75 science books . the second graders borrowed 18 of them . how many science books are left ?
[EX A]: 57

[EX Q]: jake has 6 fewer peaches than steven . steven has 13 peaches . how many peaches does jake have ?
[EX A]:
7