[Lamb Chop]

I would like to write in this way.


tab some equation some space
equation number

Requirement: The equation starts from the first left tab.

and then after some space , I list the equation number. The lenght of the
equation number varies The trick I would like to see is this number is
right aligned.

The style is similar to the table of contents.
The page number always aligns by the last digit.

thanks