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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)
54.3 = (2*x)/(0.5-x) // - (2*x)/(0.5-x)
54.3-((2*x)/(0.5-x)) = 0
54.3-2*x*(0.5-x)^-1 = 0
(-2*x)/(0.5-x)+54.3 = 0
(-2*x)/(0.5-x)+(54.3*(0.5-x))/(0.5-x) = 0
54.3*(0.5-x)-2*x = 0
27.15-56.3*x = 0
(27.15-56.3*x)/(0.5-x) = 0
(27.15-56.3*x)/(0.5-x) = 0 // * 0.5-x
27.15-56.3*x = 0
27.15-56.3*x = 0 // - 27.15
-56.3*x = -27.15 // : -56.3
x = -27.15/(-56.3)
x = 0.48223801
x = 0.48223801
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