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We're confident that we could probably answer that

if we knew what the "opposite" of a number is.

Zero. e.g. The opposite of plus 15 is minus 15 and 15-15 = 0

Why is the opposite of 15 not 1/15 ? It is the reciprocal.

Why is the opposite of 15 not 51 ? It is a mirror.

Likewise, -15 is the "negative of" 15. The opposite of a positive is always a negative.

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Q: What is the result of adding a number and it's opposite?
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Why does subtracting a number give the same result as adding its opposite?

adding its opposite?


Why is it that when subtracting an integer gives the same result as adding the opposite?

Because of the definition of addition and subtraction. When looking at a real number line: when you add you move to the left or up, when you add the opposite of a number you move in the opposite direction.


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