help with negative numbers please

[Terry Reedy]

In article <83jd7t$mi1$1 at hardcore.ivn.net>, jmace at ior.com says...
>
>This is a really quick question from an extreme newbie, after all I'm only
>14.
>If I have an equation like this: y = z - x.  How can I get y to equal either
>a negative or positive number.

Put the equation in your code as you wrote it.  If this does not answer your 
question, rephrase it.