The classic example is accounting. Debts you owe are negatives that are added to the total. If someone forgives a debt that would be subtracting a negative. Money deposited to the account is added. (To any accountants out there, I know this is way simplified it may not even be the right terms). You can also think of it as changing altitude. Sea level of zero, below sea level is negative and above is positive. A movement down is adding a negative and movement up is adding a positive (or subtracting a negative depending on how you look at it) hope this helps
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