Your mom. Have fun troll.
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The person who invented the plus sign is the same as the minus
To find the additive inverse of ANY number, add a minus sign. (If the number already has a minus sign, take the minus sign away to get the additive inverse.)
A subtraction sign.
To find the additive inverse of any number, just change the plus sign (or no sign) to a minus sign, or (as in this case), if there already is a minus sign, change it to a plus sign (or no sign).
It would be a minus sign. If the two signs are the same, the answer is positive. If the two signs are different, the answer is negative.