Question 397506
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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