(x∈R:x≥4}(x \in \mathbb{R} : x \geq 4\}(x∈R:x≥4}
{x∈R:−4<x<4}\{x \in \mathbb{R}:-4<x<4\}{x∈R:−4<x<4}
{x∈R:−4≤x≤4}\{x \in \mathbb{R} :-4 \leq x \leq 4\}{x∈R:−4≤x≤4}
{x∈R:x≤−4}\{x \in \mathbb{R}: x \leq-4\}{x∈R:x≤−4}