On Thu, Jan 17, 2008 at 03:15:49PM +0100, Ondrej Certik wrote:
> 
> On Jan 17, 2008 2:50 PM, Friedrich Hagedorn <[EMAIL PROTECTED]> wrote:
> >
> > Hello,
> >
> > how can do like this:
> >
> >   x + x**2 == x*(1 + x)
> >
> > ?
> 
> In [1]: factor(x+x**2)
> Out[1]: x*(1 + x)

Fine. Now I want do

  x - y == -1*(y - x)
  
Friedrich

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