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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.3 = (255541396-x)/x // - (255541396-x)/x
0.3-((255541396-x)/x) = 0
(-1*(255541396-x))/x+0.3 = 0
(-1*(255541396-x))/x+(0.3*x)/x = 0
0.3*x-1*(255541396-x) = 0
1.3*x-255541396 = 0
(1.3*x-255541396)/x = 0
(1.3*x-255541396)/x = 0 // * x
1.3*x-255541396 = 0
1.3*x-255541396 = 0 // + 255541396
1.3*x = 255541396 // : 1.3
x = 255541396/1.3
x = 196570304.61538462
x = 196570304.61538462
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