Answer
$-6a-5b$
Work Step by Step
By combining the like terms, the given expression, $
-2a+3b-7b-b+5a-9a
,$ simplifies to
\begin{array}{l}\require{cancel}
(-2a+5a-9a)+(3b-7b-b)
\\\\=
-6a-5b
\end{array}
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