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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(186-x)/x = 2 // - 2
(186-x)/x-2 = 0
(186-x)/x+(-2*x)/x = 0
186-x-2*x = 0
186-3*x = 0
(186-3*x)/x = 0
(186-3*x)/x = 0 // * x
186-3*x = 0
186-3*x = 0 // - 186
-3*x = -186 // : -3
x = -186/(-3)
x = 62
x = 62
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