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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8.5/102 = 19/x // - 19/x
8.5/102-(19/x) = 0
8.5/102-19*x^-1 = 0
-19*x^-1 = -0.08333333 // : -19
x^-1 = 0.00438596
-1 < 0
1/(x^1) = 0.00438596 // * x^1
1 = 0.00438596*x^1 // : 0.00438596
228.00025536 = x^1
x = 228.00025536
x = 228.00025536
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