$\left(-\infty,1\right]$\left(-\infty,1\right]

$\left[1,+\infty\right)$\left[1,+\infty\right)

$\left(-\infty,7\right]$\left(-\infty,7\right]

$\left[7,+\infty\right)$\left[7,+\infty\right)