please solve this equation for me

In two years Dorcas Will be twice as old Naomi is now.The sum of their present ages is 28.How old is each at present?
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line 1: d+n=28... line 2: d+2=2n, or d-2n=-2 .... line1 - line2: (d-d) +(n+2n) =28+2... 3n=30... n=10... from line 1, d=28-n=28=10=18
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