{x∈R:x<7}\{\mathrm{x} \in \mathbb{R}: \mathrm{x}<7\}{x∈R:x<7}
{x∈R:x>7}\{x \in \mathbb{R}: x>7\}{x∈R:x>7}
{x∈R:x<8}\{x \in \mathbb{R}: x<8\}{x∈R:x<8}
{x∈R:x>8}\{x \in \mathbb{R}: x>8\}{x∈R:x>8}
