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Answer:
17 DVDs and 23 CDs
Explanation:
x is the number of DVDs
y is the number of CDs
7x + 4y = $211
x + y = 40 ----(x4)----> 4x + 4y = 160
3x = 51
x = 17
x + y = 40
17 + y = 40
y = 23
In conclusion, 17 DVDs and 23 CDs were sold.
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