Probably you have text numbers in the 2 ranges, that's why
Try a: +0 (add a zero) to coerce it to real numbers
In P94, array-enter, ie press CTRL+SHIFT+ENTER to confirm the formula:
=SUM(D94:E94+0)-SUM(F94:O94+0)
Success? hit the yes below
Probably what Max said. You can see what the data is by using these simple
functions:
=istext(p94)
If result = TRUE, this is text
=isnumber(p94)
If result = TRUE, this is a number
Looks like you are already using =istext() so you are probably aware of this
little trick.
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