$$-7+\cos(x+8)=2$$
$x=2\pi n_{1}-i\ln(4\sqrt{5}+9)-8\text{, }n_{1}\in \mathrm{Z}$
$x=2\pi n_{2}-i\ln(9-4\sqrt{5})-8\text{, }n_{2}\in \mathrm{Z}$
