Evaluate:
4
(
2
)
3
−
4
(
2
)
4
+
20
=
\displaystyle {4}{\left({2}\right)}^{{3}}-{4}{\left({2}\right)}^{{4}}+{20}=
4
(
2
)
3
−
4
(
2
)
4
+
20
=
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