DAX Statement Subtraction - What am I missing?

[irnm8dn]

I have three datasets, and the values I am attempting to create a calculation and take each of the variables below and subtract.

i.e. Sum of Total Apples - Sum of Gala Apples - Sum of Empire Apples = Total

Clearly my answer is indicating there is a problem in my DAX statement.  

Looking for input.

Thanks in Advance.

[Ashish_Mathur]

Hi,

Share your file and show the problem clearly.

[TomMartens]

Hey,

it would be really helpful if you could share all your DAX statements.

And by the way, I'm unsure about the word dataset, I guess you in your data model are three tables?

Regars

Tom