Possible to change a label based on modular clicking?

I am trying to design an activity where students can move cards around on the screen. When they drag a card to the opposite side of the equal sign, I’d like to have them click on the card and have it both change color (this is all set) AND have the label change signs (this is what I need help with). For instance if the equation is 2x+3 = 13 and they are moving the +3 to the other side, I want them to be able to click on the +3 and have it change to a -3 on click and then back to a +3 if clicked again.

I figured out a way to do this.

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