Add the following two binomials.
(
3
a
2
−
a
7
\displaystyle {3}{a}^{{2}}-{a}^{{7}}
3
a
2
−
a
7
) + (
−
11
a
7
−
8
a
2
\displaystyle -{11}{a}^{{7}}-{8}{a}^{{2}}
−
11
a
7
−
8
a
2
)
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