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D( x )
0.6-x = 0
0.6-x = 0
0.6-x = 0
0.6-x = 0 // - 0.6
-x = -0.6 // * -1
x = 0.6
x in (-oo:0.6) U (0.6:+oo)
18/(0.6-x) = 30 // - 30
18/(0.6-x)-30 = 0
18/(0.6-x)+(-30*(0.6-x))/(0.6-x) = 0
18-30*(0.6-x) = 0
30*x = 0
(30*x)/(0.6-x) = 0
(30*x)/(0.6-x) = 0 // * 0.6-x
30*x = 0
30*x = 0 // : 30
x = 0
x = 0
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