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D( x )
0.5-x = 0
0.5-x = 0
0.5-x = 0
0.5-x = 0 // - 0.5
-x = -0.5 // * -1
x = 0.5
x in (-oo:0.5) U (0.5:+oo)
7.37 = (2*x)/(0.5-x) // - (2*x)/(0.5-x)
7.37-((2*x)/(0.5-x)) = 0
7.37-2*x*(0.5-x)^-1 = 0
(-2*x)/(0.5-x)+7.37 = 0
(-2*x)/(0.5-x)+(7.37*(0.5-x))/(0.5-x) = 0
7.37*(0.5-x)-2*x = 0
3.685-9.37*x = 0
(3.685-9.37*x)/(0.5-x) = 0
(3.685-9.37*x)/(0.5-x) = 0 // * 0.5-x
3.685-9.37*x = 0
3.685-9.37*x = 0 // - 3.685
-9.37*x = -3.685 // : -9.37
x = -3.685/(-9.37)
x = 0.39327641
x = 0.39327641
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