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NotTheSmartest  Mar 7, 2017
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Note that the sides of the larger figure are just  (32/24)  = (4/3) those of the respective sides of the smaller figure

 

Thus

 

6(4/3)  = x  - 1

 

24/3 = x - 1

 

8  = x - 1   add 1 to both sides

 

9 = x

 

 

cool cool cool

CPhill  Mar 7, 2017

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