The present age of a girl is her age after 3 years multiplied by 3 less 3 times the age of her before 3 years ago?

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Her age in 3 years=x+3; her age 3 years ago=x-3 where x is her age now.

So x=3(x+3)-3(x-3)=3x+9-3x+9=18. So she is 18 years old.
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