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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1.84-x)/x = 4 // - 4
(1.84-x)/x-4 = 0
(1.84-x)/x+(-4*x)/x = 0
1.84-x-4*x = 0
1.84-5*x = 0
(1.84-5*x)/x = 0
(1.84-5*x)/x = 0 // * x
1.84-5*x = 0
1.84-5*x = 0 // - 1.84
-5*x = -1.84 // : -5
x = -1.84/(-5)
x = 0.368
x = 0.368
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