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Mathematics: Zero to Negative, but Leave One Alone

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Here's another mathematical formula puzzle. This one however, as far as I know, I made up.

The challenge: When x is 1, it stays one, but if it's zero, it becomes negative one.


if x = 1, y = 1
if x = 0, y = -1

y = x^2+x-1
y = 2x - 1
are two possible solutions


I only thought of the last one, nice job! You're really good at these.

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