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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(0.7-x)/x = (0.338-0.539)/1.539 // - (0.338-0.539)/1.539
(0.7-x)/x-((0.338-0.539)/1.539) = 0
(0.7-x)/x-0.64977258*(0.338-0.539) = 0
(0.7-x)/x+0.13060428858 = 0
(0.7-x)/x+(0.13060428858*x)/x = 0
0.13060428858*x-x+0.7 = 0
0.7-0.86939571142*x = 0
(0.7-0.86939571142*x)/x = 0
(0.7-0.86939571142*x)/x = 0 // * x
0.7-0.86939571142*x = 0
0.7-0.86939571142*x = 0 // - 0.7
-0.86939571142*x = -0.7 // : -0.86939571142
x = -0.7/(-0.86939571142)
x = 0.80515695
x = 0.80515695
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