Question 654911
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Hi,
Cody is twice as old as Evan's age {{{highlight(x)}}}  and
Evan's age:  x
Cody's age: 2x 
nine years ago the sum of their age was 6. 
 (x-9) + (2x-9) = 6
      3x - 18 = 6
          3x = 24
           x = 8, Evan's age.  Cody is 16
and
{{{ -1 + 7 = 6}}}