For the function f(x) = (e^x +1)/(e^x-1)...

For the function `f(x) = (e^x +1)/(e^x-1)` if ` n(d)` denotes the number of integers which are not in its domain and `n(r)` denotes the number of integers which are not in its range, then `n(d)+ n(r)` is equal to

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