Answer
$-12a+b$
Work Step by Step
By combining the like terms, the given expression, $
-9a-a+6b-3a-4b-b+a
,$ simplifies to
\begin{array}{l}\require{cancel}
(-9a-a-3a+a)+(6b-4b-b)
\\\\=
-12a+b
\end{array}
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