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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
94/360 = 19.68/x // - 19.68/x
94/360-(19.68/x) = 0
94/360-19.68*x^-1 = 0
-19.68*x^-1 = -47/180 // : -19.68
x^-1 = 0.01326784
-1 < 0
1/(x^1) = 0.01326784 // * x^1
1 = 0.01326784*x^1 // : 0.01326784
75.37021851 = x^1
x = 75.37021851
x = 75.37021851
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