The integrating factor of the differential equation \( \frac{d y}{d...

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The integrating factor of the differential equation \( \frac{d y}{d x}+y=\frac{1+y}{x} \) is:
(A) \( \frac{x}{e^{x}} \)
(B) \( \frac{e^{x}}{x} \)
P
W
(C) \( x e^{x} \)
(D) \( e^{x} \)
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