Question 1147629
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Your equation is


    a + 10 = (a-10)^2


Simplify and solve


    a + 10 = a^2 - 20a + 100


    a^2 - 21a + 90 = 0


    (a-15)*(a-6) = 0.


Of the two roots, only "15" allows to subtract 10 and obtain the positive age ten years ago.


Hence, the problem has a unique <U>ANSWER</U>.  Your age is 15 years.
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