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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-1)/x-20 = 0
(x-1)/x+(-20*x)/x = 0
x-20*x-1 = 0
-19*x-1 = 0
(-19*x-1)/x = 0
(-19*x-1)/x = 0 // * x
-19*x-1 = 0
-19*x-1 = 0 // + 1
-19*x = 1 // : -19
x = 1/(-19)
x = -1/19
x = -1/19
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