Answer
$-x+3y+1$
Work Step by Step
Using order of operations, the expression $
\dfrac{1}{3}(9x-3y)-(4x-1)+4y
$ simplifies to
\begin{array}{l}
3x-y-4x+1+4y
\\=
(3x-4x)+(-y+4y)+1
\\=
-x+3y+1
.\end{array}
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