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January 30, 2015

January 30, 2015

Posted by **Ray** on Tuesday, April 17, 2012 at 7:49pm.

- math -
**please help!!**, Wednesday, April 18, 2012 at 1:15amFirst you need to assign your unknowns

Math Books: 7

History: x

Science Books: x-4

Total books: 25

so your equation is going to be

7+x+x-4=25

Then you can solve. I hope this help!

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