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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
430/x = 1.5 // - 1.5
430/x-1.5 = 0
430*x^-1 = 1.5 // : 430
x^-1 = 0.00348837
-1 < 0
1/(x^1) = 0.00348837 // * x^1
1 = 0.00348837*x^1 // : 0.00348837
286.66683867 = x^1
x = 286.66683867
x = 286.66683867
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