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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
180 = 230/x // - 230/x
180-(230/x) = 0
180-230*x^-1 = 0
-230*x^-1 = -180 // : -230
x^-1 = 18/23
-1 < 0
1/(x^1) = 18/23 // * x^1
1 = 18/23*x^1 // : 18/23
23/18 = x^1
x = 23/18
x = 23/18
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