[texhax] Exempting an equation from alignment

[Soeren D. Schulze]

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Hello,

I need to format something like this (whitespace-formatted here):

   x (x + 1) = 0
=> x_1 = 0
       x + 1 = 0
=> x_2 = -1

This is quite a stupid example, but the first and the third line are
supposed to be aligned (equal signs below each other), whereas the
second and the fourth line are not supposed to influence the alignment,
so it should _not_ look like:

            x (x + 1) = 0
=> x_1 = 0
                x + 1 = 0
=> x_2 = -1

In a table, the command for this would be `multicolumn'.  Is there
anything similar for align'ed equations?


Thank you

Sören
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