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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x/3-1)/x-3 = 0
(1/3*x-1)/x-3 = 0
(1/3*x-1)/x+(-3*x)/x = 0
1/3*x-3*x-1 = 0
-8/3*x-1 = 0
(-8/3*x-1)/x = 0
(-8/3*x-1)/x = 0 // * x
-8/3*x-1 = 0
-8/3*x-1 = 0 // + 1
-8/3*x = 1 // : -8/3
x = 1/(-8/3)
x = -3/8
x = -3/8
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