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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
120/x = 16 // - 16
120/x-16 = 0
120*x^-1 = 16 // : 120
x^-1 = 2/15
-1 < 0
1/(x^1) = 2/15 // * x^1
1 = 2/15*x^1 // : 2/15
15/2 = x^1
x = 15/2
x = 15/2
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