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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
110/360 = 40/x // - 40/x
110/360-(40/x) = 0
110/360-40*x^-1 = 0
-40*x^-1 = -11/36 // : -40
x^-1 = 11/1440
-1 < 0
1/(x^1) = 11/1440 // * x^1
1 = 11/1440*x^1 // : 11/1440
1440/11 = x^1
x = 1440/11
x = 1440/11
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