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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)
2.43 = x/(0.5-x) // - x/(0.5-x)
2.43-(x/(0.5-x)) = 0
(-1*x)/(0.5-x)+2.43 = 0
(-1*x)/(0.5-x)+(2.43*(0.5-x))/(0.5-x) = 0
2.43*(0.5-x)-1*x = 0
1.215-3.43*x = 0
(1.215-3.43*x)/(0.5-x) = 0
(1.215-3.43*x)/(0.5-x) = 0 // * 0.5-x
1.215-3.43*x = 0
1.215-3.43*x = 0 // - 1.215
-3.43*x = -1.215 // : -3.43
x = -1.215/(-3.43)
x = 0.35422741
x = 0.35422741
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