Factor the expression. Express your answer so that only positive exponents occur. x-1/7 + x-2/7

A. x-2/7(x1/7 + x)
B. x-2/7(x1/7 + 1)
C. x-2/7(x1/7)
D. x-2/7(x1/7 - 1)

Answer: B

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