Which of the following is equal to the rational expression when x does not equal to 5 or - 1

(x-7) (x+1) / (x+1) (x-5)

a - x+1/x-5

b-x-7/x+1

c - x+1/x-7

d - x-7/x-5

2+2 = x? i dont understand this

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