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D( x )
0.3-x = 0
0.3-x = 0
0.3-x = 0
0.3-x = 0 // - 0.3
-x = -0.3 // * -1
x = 0.3
x in (-oo:0.3) U (0.3:+oo)
4.6 = x/(0.3-x) // - x/(0.3-x)
4.6-(x/(0.3-x)) = 0
(-1*x)/(0.3-x)+4.6 = 0
(-1*x)/(0.3-x)+(4.6*(0.3-x))/(0.3-x) = 0
4.6*(0.3-x)-1*x = 0
1.38-5.6*x = 0
(1.38-5.6*x)/(0.3-x) = 0
(1.38-5.6*x)/(0.3-x) = 0 // * 0.3-x
1.38-5.6*x = 0
1.38-5.6*x = 0 // - 1.38
-5.6*x = -1.38 // : -5.6
x = -1.38/(-5.6)
x = 0.24642857
x = 0.24642857
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