Each pack of dvds costs 76 dollars. If there is a discount of 25 dollars on each pack how much do you have to pay to buy each pack?
First, let's introduce a variable for the cost of one DVD. Then, we can introduce a variable for the number of DVDs in a pack. Finally, we can introduce a variable for the total cost of a pack. 

Now we have all the information we need to write our equations. Let's start with the equation that states the relationship between the cost of a DVD and the total cost of a pack:

cost of DVD * number of DVDs in pack = total cost of pack

We also know that there is a 25 dollar discount on each pack, so we can write that as: 

total cost of pack - 25 = 76

Now we can solve for the total cost of the pack:

total cost of pack = 101

Now we can solve for the cost of one DVD: 

cost of DVD = total cost of pack / number of DVDs in pack

cost of DVD = 101 / number of DVDs in pack

If we plug in the values we know, we get: 

cost of DVD = 101 / 3

cost of DVD = 33.67

So each DVD costs 33.67 dollars.