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D( x )
0.85-x = 0
0.85-x = 0
0.85-x = 0
0.85-x = 0 // - 0.85
-x = -0.85 // * -1
x = 0.85
x in (-oo:0.85) U (0.85:+oo)
24 = x/(0.85-x) // - x/(0.85-x)
24-(x/(0.85-x)) = 0
(-1*x)/(0.85-x)+24 = 0
(-1*x)/(0.85-x)+(24*(0.85-x))/(0.85-x) = 0
24*(0.85-x)-1*x = 0
20.4-25*x = 0
(20.4-25*x)/(0.85-x) = 0
(20.4-25*x)/(0.85-x) = 0 // * 0.85-x
20.4-25*x = 0
20.4-25*x = 0 // - 20.4
-25*x = -20.4 // : -25
x = -20.4/(-25)
x = 0.816
x = 0.816
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