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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16.2/x = 9 // - 9
16.2/x-9 = 0
16.2*x^-1 = 9 // : 16.2
x^-1 = 0.55555556
-1 < 0
1/(x^1) = 0.55555556 // * x^1
1 = 0.55555556*x^1 // : 0.55555556
1.79999999 = x^1
x = 1.79999999
x = 1.79999999
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