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What is the solution set for this equation?

$$ \cfrac { 1 }{ x+7 } -\cfrac { 3x }{ (x+7)(x-7) } =\cfrac { -{ x }^{ 2 }+4x }{ { x }^{ 2 }-49 } $$

A

{$-1$}

B

{$-1, 7$}

C

{$-7, 1$}

D

{$1$}

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