Answer
$-1$
Work Step by Step
The given expression, $
(-1)^7
$, simplifies to
\begin{array}{l}
(-1)(-1)(-1)(-1)(-1)(-1)(-1)
\\\\=
[(-1)(-1)][(-1)(-1)][(-1)(-1)](-1)
\\\\=
1\cdot1\cdot1\cdot(-1)
\\\\=
-1
.\end{array}
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