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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/6 = 12/x // - 12/x
10/6-(12/x) = 0
10/6-12*x^-1 = 0
-12*x^-1 = -5/3 // : -12
x^-1 = 5/36
-1 < 0
1/(x^1) = 5/36 // * x^1
1 = 5/36*x^1 // : 5/36
36/5 = x^1
x = 36/5
x = 36/5
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