Simplify the collecting and combining like terms:
$3 x - 2 y - x y - (x - y + x y) + 3 x y + y - x$

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Solution

Given $3 x - 2 y - x y - (x - y + x y) + 3 x y + y - x$
$\Rightarrow (3 x - x - x) + (- 2 y + y + y) + (- x y - x y + 3 x y)$
$\Rightarrow x + x y$

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