Answer
$-2-9i$
Work Step by Step
Removing the grouping symbols and then combining the real parts and the imaginary parts, the given expression is equivalent to
\begin{array}{l}\require{cancel}
(-4+3i)+(2-12i)
\\\\=
-4+3i+2-12i
\\\\=
(-4+2)+(3i-12i)
\\\\=
-2-9i
.\end{array}