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D( x )
0.25-x = 0
0.25-x = 0
0.25-x = 0
0.25-x = 0 // - 0.25
-x = -0.25 // * -1
x = 0.25
x in (-oo:0.25) U (0.25:+oo)
6 = (2*x)/(0.25-x) // - (2*x)/(0.25-x)
6-((2*x)/(0.25-x)) = 0
6-2*x*(0.25-x)^-1 = 0
(-2*x)/(0.25-x)+6 = 0
(-2*x)/(0.25-x)+(6*(0.25-x))/(0.25-x) = 0
6*(0.25-x)-2*x = 0
1.5-8*x = 0
(1.5-8*x)/(0.25-x) = 0
(1.5-8*x)/(0.25-x) = 0 // * 0.25-x
1.5-8*x = 0
1.5-8*x = 0 // - 1.5
-8*x = -1.5 // : -8
x = -1.5/(-8)
x = 0.1875
x = 0.1875
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