Hi, 

*Note, whenever possible, use one variable in the set up

Let x represent number of Sear's iPods, 

then 8x would be the number of the Best Buy iPods

Write as we Read***

8x  -x = 490

7x = 490

x = 70, the number of Sear's iPods sold. Best Buy sells 560 (8*70)

checking our answer

560 - 70 = 490 

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