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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)
0.6/(0.6-x) = 0.2 // - 0.2
0.6/(0.6-x)-0.2 = 0
0.6/(0.6-x)+(-0.2*(0.6-x))/(0.6-x) = 0
0.6-0.2*(0.6-x) = 0
0.2*x+0.48 = 0
(0.2*x+0.48)/(0.6-x) = 0
(0.2*x+0.48)/(0.6-x) = 0 // * 0.6-x
0.2*x+0.48 = 0
0.2*x+0.48 = 0 // - 0.48
0.2*x = -0.48 // : 0.2
x = -0.48/0.2
x = -2.4
x = -2.4
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