Editor
$\int xe^{x}dx$ is equal to:
Difficulty: Easy
A: 
$-xe^{x}+e^{x}$
B: 
$\frac{x}{e^{-x}}-e^{-x}$
C: 
$\frac{e^{x}}{x}-e^{x}$
D: 
$-\frac{1}{x^{2}}e^{x}+e^{-x}$
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