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I am really confused how to calculate the following. The answer is $40$, but what are the steps to get $40$? $$\frac{200}{x+10} = \frac{200}{x} - 1.$$ Thank you.

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    I had no intentions to dig up this thread; I came to this page via related thread while reading another question; The algebra tag was obsolete and 200/x still seems odd in my eyes so without much though I edited this, I didn't noticed the asking date before (which I should have noticed). I apologize for any if anybody become frustrated due to this action. Thanks.2011-12-08

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