IF function

I have a table with several columns and want to make it work this way
If E7 is empty, than H7is empty
If E7 has X, than H7 is empty
If E7 has any other value than X H7 has X

=IF(E7<>0,"X",IF(E7="","",IF(E7=X,"")))

My formula isn't working, because X falls under <>0, so when there is an X in E7 I get an X in H7, but I need it to be available to accept a different value.
Also, how can I apply this formula to several columns within the same table, meaning if there is a value in, let's say, E7 other cells (like J7, K7) will automaticaly receive an X?
In this case E7 is the first cell from the left, so all others in the row will be filled in as I go, but what if value has to be put in in cell K7? I can go directly to it, but wil it put an X into other cells.
Basicaly all these cells receive the same value but only one of them in given row can have it, the others I want to have an X, so I don't put anything in it by accident.
Thank You in advance for helping

Thanks, but when I pu your formula in H7 all cells in the column show an X, if i put X in E7 nothing changes in H7, if I put anything different than X in E7, H7 shows FALSE, I want it to be empty.
Can you suggest something else?
Thanks

Thanks, it works, but when I put the amount into H7 it shows inconsistent calculated column formula, I noticed that with my formulas as well (althogh calculations are correct) shoul I ignore it or there's a fix for this?
I also wanted to be able to put an amount in F7 if E7 has a value other than X or blank.
I used =IF(E7="X","X",IF(E7="","",IF(E7<>0,0)))
and it works, but it puts $0.00 and when I use real amount the I get same "inconsistent" message. I just don't know how to do it.
It won't let me put <>0 again at the end.
Thanks

OK, how do I get it to you?

Thank You for helping

If E7 = "X" then you want "X" in F7
If E7 = nothing then you want nothing in F7
if E7 = number or word I need to put an amount into F7 and the way it is now $0.00 comes up. When I change it to real number it shows inconsistent column formula.
And if anything is in that or other formula controlled cell, formula disapeares, I have to copy it from untouched cell of the same column - is there any way to protect formula in cells?

Thanks, Jeff. It works similar to other formulas and has that little column formula inconsistency sign. Should I simply ignore it or it's possible to turn this feature of for this worksheet?
Can you please look at the first message in this thread about filling in cells in the one given row. I'd like to use it on second worksheet in this workbook and other similar workbooks.