how can i simplify this equation further?

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Source: — Data Sufficiency |

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by scoobydooby » Tue Mar 17, 2009 5:25 am
1/5 < 1/(x+1) < 1/2

=5>(x+1)>2 (flip signs for reciprocals)
=5-1>x>2-1 (subtract 1 throughout)
=4>x>1