Variable

I'm trying to do a quiz. I have a trigger on a selection to add +1 to a variable totalScore. Thus if they get the answer right their score is 1.

My problem is adding a minus point with a wrong selection. In the trigger wizard/ action/ variable I can only create a -1. This does not take one point off however, if just sends the score from 1 to -1 (whereas it should have just minused 1 from the 1 total, to make 0). Any solution please?

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