i guess it would be "only"
E.G. Any could be anything whilst only can be just one thing
Wow that was confusing
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When x is not zero, it can be (x + 1/x).
If the opposite is meant to be the additive opposite and not the multiplicative opposite, then their sum is zero. The reason is that is what defines an additive opposite!
Opposite angles do not bisect any shapes.
The [multiplicative] opposite of -2 is -0.5, which is negative.
Any positive numbers opposite is the same number just as a negative.