Find a power series representation for f(x) = (1+x)/(1-x). Determine interval of convergence

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Can you explain how the summation of x^n + the summation of x^n+1 equals 1 + the summation of x^n + the summation of x^n? I don't get how you just got one out of air

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Thank you very much for your videos, they are always well thought out and concise!

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