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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/20 = 4/x // - 4/x
6/20-(4/x) = 0
6/20-4*x^-1 = 0
-4*x^-1 = -3/10 // : -4
x^-1 = 3/40
-1 < 0
1/(x^1) = 3/40 // * x^1
1 = 3/40*x^1 // : 3/40
40/3 = x^1
x = 40/3
x = 40/3
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