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  • 01-02-2017
  • Mathematics
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Аноним Аноним
  • 01-02-2017
Apply proportionality theorem here, 
21/9 = x+6 / x
21x = 9(x+6)
21x = 9x + 54
21x - 9x = 54
12x = 54
x = 54/12
x = 4.5

In short, Your Answer would be 4.5

Hope this helps!
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