Find the x-values (if any) at which f is not continuous. If there are any discontinuities, determine whether they are removable. (Enter your answers as comma-separated lists. If an answer does not exist, enter DNE.) f(x) = {1 5x + 1, x ≤ 5 6 − x, x > 5 removable discontinuities x = nonremovable discontinuities x =