$$( - 2 ) ^ { 5 } \times ( - 2 ) ^ { 7 } = ( - 2 ) ^ { x }$$
$x=\frac{2\pi n_{1}i}{\ln(2)+\pi i}+\frac{12\ln(2)}{\ln(2)+\pi i}$
$n_{1}\in \mathrm{Z}$
$x=12$
