Compute substraction of count with Visual builder

I'd like to know how I can compute the substraction between 2 results of count in visualbuilder.
For each count, we've got a different filter.
I'd like to obatin the difference between total and nb OK. Is it possible to realize it?

Add a math aggregation and follow the instruction the config there and you can do subtractions with it.

Sorry but I don't understand how to do it because here, i've got 2 different series, my count is not on the same serie so how can I do ? I can't do a math aggregation ... Thks.

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