math!!

Find the value of x.

x / x+5 = x-4 / x

the book says the answer is 20, but im not getting that. I crossed multiplied and got x^2=(x+5)(x+4) and then multiplied that out x^2 = x^2 + 9x+ 20 and then 9x=20.. what am I doing wrong?

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  1. those are proportions by the way

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  2. little mistake
    you got x²=(x+5)(x-4)

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  3. oooooh! i was wondering what i did. thank you =]

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