Re: symbolic evaluation

• To: mathgroup at smc.vnet.net
• Subject: [mg86982] Re: symbolic evaluation
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Fri, 28 Mar 2008 03:14:37 -0500 (EST)
• Organization: The Open University, Milton Keynes, UK
• References: <fsg6n1\$j55\$1@smc.vnet.net>

```news.east.cox.net wrote:

> I'm using Mathematica 5.1 I want to evaluate a simple equation
> symbolically, such as 7x = 14. of course the answer should be x = 14/7.
> I can't find a clear example on how to do this with a simple equation.

I am not sure whether the issue is about keeping the rational number
14/7 in its unsimplified form (Mathematica will simplify it
automatically to two). If this is the case, you could use HoldForm (at
least for simple expression). For instance,

In[1]:= Reduce[7 x == HoldForm@14]

Out[1]=
14
x == --
7

Otherwise, you can just use Reduce, Solve, or even Simplify as in the
following examples.

In[2]:= Reduce[7 x == 14]

Out[2]= x == 2

In[3]:= Solve[7 x == 14]

Out[3]= {{x -> 2}}

In[4]:= Simplify[7 x == 14]

Out[4]= x == 2

Regards,
--
Jean-Marc

```

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