Answer:
Santosh purchased 4 new and 4 used DVDs.
Step-by-step explanation:
From the information given, as you know that Santosh spent $200 and that the DVD player cost $120, you can say that the new and used DVDs cost $80, which can be expressed as:
15x+5y=80, where:
x refers to the number of new DVDs
y refers to the number of used DVDs
Now, as the statement indicates that Santosh purchased the same number of new and used DVDs, this means that x is equal to y and you can replace y with x and solve for x:
15x+5x=80
20x=80
x=80/20
x=4
According to this, the answer is that Santosh purchased 4 new and 4 used DVDs.
[ Answer ]

[ Explanation ]
-3(n + 5) = -21
Divide Both Sides By -3
= 
Simplify:
N + 5 = 7
Subtract 5 From Both Sides:
N + 5 - 5 = 7 - 5
Simplify:
N = 2
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Answer: But I put b
Step-by-step explanation:
Answer:
2n - 7
Step-by-step explanation: