Answer
$6$
Work Step by Step
By removing the parentheses subtracting each term of the subtrahend then combining like terms, we obtain:
\begin{align*}
(3 - 4i) -( - 3 - 4i)&=3-4i-(-3)-(-4i)\\
&=3-4i+3+4i\\
&=(3+3)+(-4i+4i)\\
&=6
\end{align*}
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