Answer
$-12-5i$
Work Step by Step
Removing the grouping symbols and then adding the real parts and the imaginary parts, the given expression, $
(-5-i)-(7+4i)
,$ simplifies to
\begin{array}{l}\require{cancel}
-5-i-7-4i
\\\\=
(-5-7)+(-i-4i)
\\\\=
-12-5i
.\end{array}