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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/9 = 12/x // - 12/x
5/9-(12/x) = 0
5/9-12*x^-1 = 0
-12*x^-1 = -5/9 // : -12
x^-1 = 5/108
-1 < 0
1/(x^1) = 5/108 // * x^1
1 = 5/108*x^1 // : 5/108
108/5 = x^1
x = 108/5
x = 108/5
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