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Re: Solve equation with summation?

• To: mathgroup at smc.vnet.net
• Subject: [mg122960] Re: Solve equation with summation?
• From: "Dr. Wolfgang Hintze" <weh at snafu.de>
• Date: Fri, 18 Nov 2011 07:50:03 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <ja5f56$69e$1@smc.vnet.net>

Sorry, but with me both expressions (exactly copied from your message) 
give the same result.
Regards,
Wolfgang

"Ivan" <iveney at gmail.com> schrieb im Newsbeitrag 
news:ja5f56$69e$1 at smc.vnet.net...
> For a summation like \sum_{i=1}^n a_i/x = 1,
>
>  Solve[Sum[Subscript[a, i], {i, 1, n}]/x == 1, x]
>
> gives a correct solution.
>
> However, by putting x into the summation:
>
>  Solve[Sum[Subscript[a, i]/x, {i, 1, n}] == 1, x]
>
>
> gives an empty set, why?
>