So I tiped some equation, and when you want to get back to fix a number it highlights the number or the sign (+ or -), instead of having a line l. What I mean is that when you want to go back it retypes over what you have in your equation instead of just adding the stuff you want to fix. I don't know if this makes any sense, but I need help formating the equation so that it doesn't write over what you have written once you go back.
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