Simplify:
5
x
4
+
4
x
5
+
3
x
4
+
7
+
9
x
5
\displaystyle {5}{x}^{{4}}+{4}{x}^{{5}}+{3}{x}^{{4}}+{7}+{9}{x}^{{5}}
5
x
4
+
4
x
5
+
3
x
4
+
7
+
9
x
5
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Question 6
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