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The negative of a negative is always the original number.
I read newspaper
1964
Check under collectibles.
You minus it off the original negative number, so if it was -5 plus -2 it equals -7
About $175,000 if in mint...
Again , what is the value of a 1937 newspaper of President Franklin Roosevelt and his wife on the front page about his second term
A negative number is an opposite or reversal of a positive number. For example, if a million dollars is a lot of money to have, then it is also true that a million dollars is a lot of money to owe. If you reverse something twice, you return to the original state. So a negative times a negative (or a negative divided by a negative) is a positive. The opposite of the opposite is the original.
In a negative feedback system the response of the effector reverses the original stimuli.
A properly authenticated and notarized copy could be used. There could be some issues concerning who destroyed the original and why.
It depends on the operation and values of the positive and negative. For example, in multiplication or division a positive and negative will be a negative. In addition or subtraction, it depends on the absolute value of the original numbers.
The result can be either positive or negative, depending on the sizes of those original two negative numbers. (-8) minus (-10) = positive 2 (-8) minus (-5) = negative 3