Equivalent Expressions

SAT Math· difficulty 4/5

\dfrac{1 - \frac{1}{x}}{1 + \frac{1}{x}}

A
$\dfrac{x}{x + 1}$
B
$\dfrac{x - 1}{x + 1}$
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C
$\dfrac{1 - x}{1 + x}$
D
$\dfrac{x + 1}{x - 1}$

Explanation

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