Simplify the expression by adding the polynomials:
(
−
7
y
4
−
6
y
3
−
5
y
2
+
6
y
−
6
)
+
(
−
2
y
4
−
9
y
3
+
8
y
2
−
10
y
+
9
)
\displaystyle {\left(-{7}{y}^{{4}}-{6}{y}^{{3}}-{5}{y}^{{2}}+{6}{y}-{6}\right)}+{\left(-{2}{y}^{{4}}-{9}{y}^{{3}}+{8}{y}^{{2}}-{10}{y}+{9}\right)}
(
−
7
y
4
−
6
y
3
−
5
y
2
+
6
y
−
6
)
+
(
−
2
y
4
−
9
y
3
+
8
y
2
−
10
y
+
9
)
The expression simplifies to
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