Could this be factored any further?

Question

My friend recently told me that $\frac{-x}{x}$ could not be simplified any further. Is he correct or could it be simplified such that the answer isn't undefined when you x=0?

Answer 1

Well this is how it is $$- \frac{x}{x} = \begin{cases} -1 & \text{if} & x \neq 0 \\ \text{undefined} & \text{if} & x = 0 \end{cases}$$