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If a number is added to the numerator of 7/8, and the same number is subtracted from the denominator, the result is 2, find the number?

If a number is added to the numerator of 7/8, and the same number is subtracted from the denominator, the result is 2, find the number?
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1 Answer

7/8  8/7  9/6  10/5=2
Sometimes doing it is good. 
If you want to get complicated
(7+x)/(8-x) = 2
7+x=2(8-x)
7+x=16-2x
3x=9
x=3 which gives (7+3)/(8-3) = 10/5 = 2

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