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The Distributive Property is a property which states that

Now, let's apply this property:

(Answer)
Hope you find it helpful.
Feel free to ask if you have any doubts.

Well I don't get what the other parts of the question is asking, but they can make 240 packs of pencils.
Answer:
19
Step-by-step explanation:
15z-14z=12+7
z=19