I'm working on a home budget, and I've made 26 sheets (labeled 1-26, aptly).
Each of the sheets calls the previous information from the other sheets, and
if I change something (say add a cost of 100 dollars to one column), it
retroactively affects the other sheets. It took a long time for me to
physically go in and change the equations on each sheet to call the previous
sheet - every time i have to make a change, i have to change 26 sheets.

Example:
= '1'!F20 + D20 - E20 on '2'
= '2'!F20 + D20 - E20 on '3'
etc...

I was wondering if there was a way to call the name of the current sheet as
a variable in an equation, in such that I could write an equation like this:

= '('currentsheet' - 1)'!F20 + D20 - E20

That way I could simply use the same equation in all 25 sheets following
sheet 1. Is there such a way?