$$-3\ \cos(x+5)=2$$
$x=2\pi n_{1}+3\pi -\arccos(\frac{2}{3})-5\text{, }n_{1}\in \mathrm{Z}$
$x=2\pi n_{2}+\arccos(\frac{2}{3})+3\pi -5\text{, }n_{2}\in \mathrm{Z}$
