Expresions on decks

I want to get the expresion 35-num_Pieces from a deck
So I created a expresion to count in the deck : expresion:35-$Deck_numPieces$ and then in a text label: The count is $Deck_expresion$

What am i doing wrong?
expresion must be :
expresion:35-$Deck_numPieces$ OR

How can i do it? Thanks in advance
PD: 35 is a constant,of course

You can’t do arithmetic (add/subtract, etc.) in properties expressions. This is a feature for an unspecified future release.


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