Hi

Let x represent her age NOW

Question states***Write as we Read

 x = 3(x+3) - 3(x-3)

solving for x

 x = 3x+9 - 3x + 9

 x = 18, her age NOW



CHECKING our Answer***

  18 = 3*21 - 3* 15 = 63 - 45 

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