$\left(-\infty,-\frac{2}{3}\right)$\left(-\infty,-\frac{2}{3}\right)

$\left(-\infty,\frac{2}{3}\right)$\left(-\infty,\frac{2}{3}\right)

$\left(-\frac{2}{3},+\infty\right)$\left(-\frac{2}{3},+\infty\right)

$\left(\frac{2}{3},+\infty\right)$\left(\frac{2}{3},+\infty\right)