Mashaal Masha
Which expression is equivalent to $\frac{4}{4x-5} - \frac{1}{x+1}$?
Difficulty: Hard
A: 

$\frac{1}{(x+1)(4x-5)}$

B: 

$\frac{3}{3x-6}$

C: 

$-\frac{1}{(x+1)(4x-5)}$

D: 

$\frac{9}{(x+1)(4x-5)}$

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