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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5.7-x)/x = 0.424 // - 0.424
(5.7-x)/x-0.424 = 0
(5.7-x)/x+(-0.424*x)/x = 0
5.7-x-0.424*x = 0
5.7-1.424*x = 0
(5.7-1.424*x)/x = 0
(5.7-1.424*x)/x = 0 // * x
5.7-1.424*x = 0
5.7-1.424*x = 0 // - 5.7
-1.424*x = -5.7 // : -1.424
x = -5.7/(-1.424)
x = 4.00280899
x = 4.00280899
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