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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/10 = 108/x // - 108/x
16/10-(108/x) = 0
16/10-108*x^-1 = 0
-108*x^-1 = -8/5 // : -108
x^-1 = 2/135
-1 < 0
1/(x^1) = 2/135 // * x^1
1 = 2/135*x^1 // : 2/135
135/2 = x^1
x = 135/2
x = 135/2
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