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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
x in (-oo:0) U (0:+oo)
0.75 = 0.25/(0.6*x) // - 0.25/(0.6*x)
0.75-(0.25/(0.6*x)) = 0
0.75-0.41666667*x^-1 = 0
-0.41666667*x^-1 = -0.75 // : -0.41666667
x^-1 = 1.79999999
-1 < 0
1/(x^1) = 1.79999999 // * x^1
1 = 1.79999999*x^1 // : 1.79999999
0.55555556 = x^1
x = 0.55555556
x = 0.55555556
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