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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*x)/(0.5-x) = 7.4 // - 7.4
(2*x)/(0.5-x)-7.4 = 0
(2*x)/(0.5-x)+(-7.4*(0.5-x))/(0.5-x) = 0
2*x-7.4*(0.5-x) = 0
9.4*x-3.7 = 0
(9.4*x-3.7)/(0.5-x) = 0
(9.4*x-3.7)/(0.5-x) = 0 // * 0.5-x
9.4*x-3.7 = 0
9.4*x-3.7 = 0 // + 3.7
9.4*x = 3.7 // : 9.4
x = 3.7/9.4
x = 0.39361702
x = 0.39361702
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