Change existing value of cell with formula

I have a spreadsheet with 3 columns. Columd (C) has all negatine numbers in it. I want to add a nhew column (D) where I can enter a value and want it to deduct that value from column (C). Conversly, I want to add other columns and have them do the same thing as (D).

HOW CAN I DO THAT?

By: Lloyd Jack

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