Answer
$4(y-1)$
Work Step by Step
Factoring the $GCF=
4
,$ the given expression, $
4y-4
,$ is equivalent to
\begin{array}{l}\require{cancel}
4
\left(
\dfrac{4y}{4}-\dfrac{4}{4}
\right)
\\\\=
4(y-1)
.\end{array}
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