If/Then statement with math equation

I am wanted to create a formula in a Smartsheet that references 1 cell with a "True" response to then subtract 1 from a different cell. For Example:

"if[Type of card}=Mobil, then - 1 from [#of cards left Row below]

I know this isn't correct verbiage. The data is coming off a form. There are 2 types of cards that can be entered. If it is one type, then the # of cards left would be reduced by one.

Is this possible? If so, how?

Answers

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