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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.98 = (1-x)/x // - (1-x)/x
3.98-((1-x)/x) = 0
(-1*(1-x))/x+3.98 = 0
(-1*(1-x))/x+(3.98*x)/x = 0
3.98*x-1*(1-x) = 0
4.98*x-1 = 0
(4.98*x-1)/x = 0
(4.98*x-1)/x = 0 // * x
4.98*x-1 = 0
4.98*x-1 = 0 // + 1
4.98*x = 1 // : 4.98
x = 1/4.98
x = 0.20080321
x = 0.20080321
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