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Math·Advanced Math·Nonlinear equations in one variable and systems of equations in two variables

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$$\frac{1}{x}+\frac{1}{x-9}=\frac{4}{x^2-9x}$$

What are all the solutions to the given equation?

A

$-1$ and $4$

B

$0$ and $9$

C

$2$

D

$\frac{13}{2}$