math

if 3+x / 7+x = 3/7 + 3/7, then x= what

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asked by stacey
  1. Don't post the same question using different names please.

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    posted by Reiny
  2. ok

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    posted by Kay
  3. Well, the spacing makes me interpret this as

    (3+x)/(7+x) = 3/7 + 3/7

    I still suspect a typo on the right side, but now at least we have

    (3+x)/(7+x) = 6/7
    7(3+x) = 6(7+x)
    21+7x = 42+6x
    x = 21

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    posted by Steve

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