Answer
$7\sqrt[3]{4y}$
Work Step by Step
By combining like radicals, the given expression simplifies to
\begin{array}{l}\require{cancel}
5\sqrt[3]{4y}+2\sqrt[3]{4y}
\\\\=
(5+2)\sqrt[3]{4y}
\\\\=
7\sqrt[3]{4y}
.\end{array}
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