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What isn't x?

Algebra Level 1

What is the difference between these two:

$y = 1 \text{ and } y =\frac{x}{x}?$

There is no answer at

x = 1

There is no answer at

x=-1

There is no answer at

x=0, 1, -1

There is no answer at

x = 0

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by Stephen Halby

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