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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)
x/(0.3-x) = 5 // - 5
x/(0.3-x)-5 = 0
x/(0.3-x)+(-5*(0.3-x))/(0.3-x) = 0
x-5*(0.3-x) = 0
6*x-1.5 = 0
(6*x-1.5)/(0.3-x) = 0
(6*x-1.5)/(0.3-x) = 0 // * 0.3-x
6*x-1.5 = 0
6*x-1.5 = 0 // + 1.5
6*x = 1.5 // : 6
x = 1.5/6
x = 0.25
x = 0.25
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