How to represent $x = -6$ in terms of $y$?

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I have the equation $x = 0$ which needs to only be graphed when the y values are between 0 and 3. This can be represented as the following equation. $$x=0y,\quad \{0<y<3\}$$ How can I do the same thing with the equation $x=-6$ where it is only graphed when the y values are between 0 and 3?