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Math·Algebra·Linear equations in one variable

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Which of the following equations has exactly one solution?

A

$\frac{1}{44}+x=x$

B

$\frac{1}{44}+x=-x-\frac{1}{44}$

C

$\frac{1}{44}-x=\frac{1}{44}-x$

D

$\frac{1}{44}-x=-x$