In our class, madam showed that subtracting means moving left, but subtracting a negative is like taking away a debt. If you take away a debt, you gain, so you move right. It reminds me of when my amma scolds me for losing two marbles—"Iyyavu two marbles!"—but then finds them in my pocket and gives them back. That's adding, no? But taking away the scolding feels like moving right on my mood-line, isn't it?
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