Combine Like Terms:
5
x
y
−
9
y
2
+
9
x
−
6
x
y
−
7
x
2
+
x
y
−
8
y
2
\displaystyle {5}{x}{y}-{9}{y}^{{2}}+{9}{x}-{6}{x}{y}-{7}{x}^{{2}}+{x}{y}-{8}{y}^{{2}}
5
x
y
−
9
y
2
+
9
x
−
6
x
y
−
7
x
2
+
x
y
−
8
y
2
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Question 6
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