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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.5/9 = 16/x // - 16/x
3.5/9-(16/x) = 0
3.5/9-16*x^-1 = 0
-16*x^-1 = -0.38888889 // : -16
x^-1 = 0.02430556
-1 < 0
1/(x^1) = 0.02430556 // * x^1
1 = 0.02430556*x^1 // : 0.02430556
41.14284962 = x^1
x = 41.14284962
x = 41.14284962
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