Zero.
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Well, let's take a moment to appreciate the number 94. It is a rational number because it can be expressed as a simple fraction, in this case, 94/1. Remember, every number is special in its own way, just like every brushstroke adds beauty to a painting.
0 is a whole rational integer in its own right because as for example water freezes at 0 degrees Celsius
x=y is the identity. It is its own inverse. So the inverse is y=x.
They are 0 which is its own additive opposite. 0 does not have a multiplicative opposite.
The inverse of a function is its reflection in the line y=x. so the only function that returns its own inverse is the line y=x or any part of the line y=x