Getting FALSE on nested ifs function

Hi.

Function used:
=IF(R17="X","", IF(I17>0, SUM(D17*D$5+E17+F17-I17, IF(I17<0, SUM(D17*D$5+E17+F17+I17, SUM(D17*D$5+E17+F17))))))

1. If there's an X in cell R17 then there should be no output.
2. If cell I17 is greater than 0 then do the following sum function.
3. If cell I17 is less than 0 do the following sum function.
4. If it doesn't fit any of the previous criterias do the last sum function.

It's failing on the last two, less than 0 and doesn't fit any of the above criterias and the output is false.

I suspect I'm failing at setting it up for more than two different scenarios, but can't quite figure out how to solve this.

All help is appreciated and thank you in advance.

Br,
Eirik

You're missing some brackets.

Formula:

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