Ok, ive posted this before, but many people got confused and dint know what i was talking about. Im going to try again, because this is extremly important to me.

Ok.

If u have a set of random numbers, lets say 5 of them.
Lets say their all tied together by their differences in numbers.

So # 1 & # 2 have a difference of 5.
#3 has a difference of 4 with 5 - ^
#4 has a difference of 6 with 4
#5 has a difference of 2 with 6
and so on.... so it would look like this.

X1,X2,X3,X4,11

Lets say i gave u the last number, and the difference between 11 and X4. And said it was 2.

X1 - X2 = A# ( - does not mean nagative, means difference)
X3 - A# = B#
X4 - B# = C#
11 - C# = 2

.....i lost most of ya dint i? ........ anyways, how can i reverse this equasion.
What i tried to do is

Lets say i have the #'s.
1, 2, 3, 6, 7 (their all random).

I tried doing this
2 - 1 = 1
3 - 1 = 2
6 - 2 = 4
7 - 4 = 3

and then, i tried making a third colum of the differences I got in the first one.
2 - 1 = 1
4 - 1 = 3
3 - 3 = 0

But there was no way of reversing this one either, even though i had the last numbers of all the colums.

1, 2, 3, 6, 7
-1 -2- 4- 3
-1 -3 -0

Is anyone following me? So if i give u 7, 3, 0
Could u reverse this? Is this even possible?

And to those that skimed this post, were working with RANDOM numbers, so read over it if your thinking you can solve this with a number sequence with differences or something.

If you have any more questions, ill answer them asap because i know this is probably confusing alot of you, its just hard to explain.