Simplify.
3
z
4
−
5
z
2
−
8
z
4
+
9
z
2
+
10
z
=
\displaystyle {3}{z}^{{4}}-{5}{z}^{{2}}-{8}{z}^{{4}}+{9}{z}^{{2}}+{10}{z}=
3
z
4
−
5
z
2
−
8
z
4
+
9
z
2
+
10
z
=
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