How to use Equations?

I found how to solve equations with Excel.
But don't have any idea how to do it with Numbers.
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The value x is in B1
Set some cell to this formula
Highlight that cell and select Tools | Goal Seek. It will prompt you Set cell: (cell you highlighted)  To value: enter 800 By changing cell: enter B1, because that is where x is.
Press OK. Excel will find the value of x (=398) and if you press OK it will put 398 in cell B1.

3dcookingAuthor Commented:
That is a solution for Excel.
But is there a possibility to substitute Goal Seek on iWork "Numbers" on Mac?

According to the document below and my own experience Numbers does not support this:

If you seek a free solution which does you can use openoffice 3.0

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