If $\frac{x-3}{|x-3|} \geq 0$, then $x$ belongs to the interval ________________
If $\frac{x-3}{|x-3|} \geq 0$
$\Rightarrow \quad|x-3| \geq 0$
i. e. $\quad x-3 \geq 0$
i.e. $\quad x \geq 3$
i.e. $\quad x \in[3, \infty)$
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