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D( x )
0.14-(2*x) = 0
0.14-(2*x) = 0
0.14-(2*x) = 0
0.14-2*x = 0
0.14-2*x = 0 // - 0.14
-2*x = -0.14 // : -2
x = -0.14/(-2)
x = 0.07
x in (-oo:0.07) U (0.07:+oo)
(4*x)/(0.14-(2*x)) = 4.6 // - 4.6
(4*x)/(0.14-(2*x))-4.6 = 0
(4*x)/(0.14-2*x)-4.6 = 0
(4*x)/(0.14-2*x)+(-4.6*(0.14-2*x))/(0.14-2*x) = 0
4*x-4.6*(0.14-2*x) = 0
13.2*x-0.644 = 0
(13.2*x-0.644)/(0.14-2*x) = 0
(13.2*x-0.644)/(0.14-2*x) = 0 // * 0.14-2*x
13.2*x-0.644 = 0
13.2*x-0.644 = 0 // + 0.644
13.2*x = 0.644 // : 13.2
x = 0.644/13.2
x = 0.04878788
x = 0.04878788
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