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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20/12 = 6/x // - 6/x
20/12-(6/x) = 0
20/12-6*x^-1 = 0
-6*x^-1 = -5/3 // : -6
x^-1 = 5/18
-1 < 0
1/(x^1) = 5/18 // * x^1
1 = 5/18*x^1 // : 5/18
18/5 = x^1
x = 18/5
x = 18/5
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