subtracting and showing minus

Hi.

I want to subtract points when the wrong thing is clicked and add them when the right thing is clicked. I have a separate variable to show the points, which is called Total.  I have a box to show the total.

The variable to add points works but not to subtract points.

You can see the variable from my screen shot. Please advice me on what I am doing wrong.

I am using Storyline 2.

Thank you,

Iffaf

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