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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-330915)/x = 49 // - 49
(x-330915)/x-49 = 0
(x-330915)/x+(-49*x)/x = 0
x-49*x-330915 = 0
-48*x-330915 = 0
(-48*x-330915)/x = 0
(-48*x-330915)/x = 0 // * x
-48*x-330915 = 0
-48*x-330915 = 0 // + 330915
-48*x = 330915 // : -48
x = 330915/(-48)
x = -110305/16
x = -110305/16
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