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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3/5)/2 = (1/4)/x // - (1/4)/x
(3/5)/2-((1/4)/x) = 0
(-1/4)*x^-1+(3/5)/2 = 0
-1/4*x^-1 = -3/10 // : -1/4
x^-1 = 6/5
-1 < 0
1/(x^1) = 6/5 // * x^1
1 = 6/5*x^1 // : 6/5
5/6 = x^1
x = 5/6
x = 5/6
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