If your credit (not debit) card has a negative balance on your statement, then there is an overpayment (you paid more than you owe). So now they owe you money. This is usually applied towards future charges.
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This means you have a negative balance.
Perhaps you mean minus minus one is plus one. Like subtracting (taking away) a debt is equivalent to adding on. If you bank balance is two dollars in the red (debt) if you add 2 dollars, that debt has gone. minus 2 minus minus 2 is zero, same as minus 2 plus 2 is zero.
They equal a minus and two +'s or two -'s equal a + :)
If you mean CI minus XLVIII then it is LIII because 101 minus 48 = 53
If you mean 668 minus 412 then it is 256