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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.1/5.1 = 882/x // - 882/x
4.1/5.1-(882/x) = 0
4.1/5.1-882*x^-1 = 0
-882*x^-1 = -0.80392157 // : -882
x^-1 = 0.00091148
-1 < 0
1/(x^1) = 0.00091148 // * x^1
1 = 0.00091148*x^1 // : 0.00091148
1097.11677711 = x^1
x = 1097.11677711
x = 1097.11677711
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