Perform the indicated operations and simplify:
7
(
4
n
+
4
(
n
+
7
k
)
+
7
k
)
\displaystyle {7}{\left({4}{n}+{4}{\left({n}+{7}{k}\right)}+{7}{k}\right)}
7
(
4
n
+
4
(
n
+
7
k
)
+
7
k
)
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