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The sum of the present age of Abe and his age 7 years ago is 31.
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The sum of the present age of Abe and his age 7 years ago is 31.

User Hatatister
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x + (x-7) = 31
2x - 7 (+7) = 31 (+7)
2x = 38
2x/2 = 38/2

x = 19

hope this helps
User Jim Heising
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