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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)
49 = (2*x)/(0.5-x) // - (2*x)/(0.5-x)
49-((2*x)/(0.5-x)) = 0
49-2*x*(0.5-x)^-1 = 0
(-2*x)/(0.5-x)+49 = 0
(-2*x)/(0.5-x)+(49*(0.5-x))/(0.5-x) = 0
49*(0.5-x)-2*x = 0
24.5-51*x = 0
(24.5-51*x)/(0.5-x) = 0
(24.5-51*x)/(0.5-x) = 0 // * 0.5-x
24.5-51*x = 0
24.5-51*x = 0 // - 24.5
-51*x = -24.5 // : -51
x = -24.5/(-51)
x = 0.48039216
x = 0.48039216
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