determine the singular points of the given differential equation. classify each singular point as regular or irregular. (enter your answers as a comma-separated list. include both real and complex singular points. if there are no singular points in a certain category, enter none.)
(x^2 + x − 20)y'' + (x + 5)y' + (x − 4)y = 0

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the true statements are:

r = set of real numbers

n = set of natural numbers, 1,2,

w = n u{0} = {0,1,}

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