- $ D = \\\mathbb{R}\\\backslash \\\left\\\{ { - 1;6} \\\right\\\}$
- $ D = \\\mathbb{R}\\\backslash \\\left\\\{ {1; - 6} \\\right\\\}$
- $ D = \\\left\\\{ { - 1;6} \\\right\\\}$
- $ D = \\\left\\\{ {1; - 6} \\\right\\\}$