Find the x-values (if any) at which f is not continuous. If there are discontinuities, determine whether they are removable. (Enter your answers as comma-separated lists. If an answer does not exist, enter DNE.) f(x) = 9 csc (7x), 1x-3152 |x - 3|>2 18, removable discontinuities nonremovable discontinuities X =

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