You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

[Q]: Context: Lewis earns $ 21 every week during the 216 weeks of harvest. If he has to pay $ 702 tax 

 Question: How much money will have at the end of the harvest season?
[A]: 3834


[Q]: Context: Dave had 24 apps and 9 files on his phone. After deleting some apps and files he had 5 files and 12 apps left. 

 Question: How many more apps than files does he have left on the phone?
[A]: 7


[Q]: Context: There were 21 roses in the vase. Jessica threw away 34 roses from the vase and cut some more new roses from her flower garden to put in the vase. There are now 15 roses in the vase. 

 Question: How many more roses did she throw away than those she cut from her garden?
[A]:
6