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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
120/360 = 28.61/x // - 28.61/x
120/360-(28.61/x) = 0
120/360-28.61*x^-1 = 0
-28.61*x^-1 = -1/3 // : -28.61
x^-1 = 0.01165094
-1 < 0
1/(x^1) = 0.01165094 // * x^1
1 = 0.01165094*x^1 // : 0.01165094
85.82998453 = x^1
x = 85.82998453
x = 85.82998453
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