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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Difference. A sum is the result of adding two numbers, and a difference is the result of subtracting two numbers.
Subtract the number you first thought of.
The opposite number of 9 is -9. In mathematics, the opposite of a number is the same distance from zero on the number line, but in the opposite direction. This is denoted by adding a negative sign in front of the number, indicating its direction opposite to the original number.
sum
They are both binary operations. The inverse of adding X to a number is the subtraction of X from the result and, conversely, subtracting Y from a number is the inverse of adding Y to the result.