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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/2.2 = 25/x // - 25/x
10/2.2-(25/x) = 0
10/2.2-25*x^-1 = 0
-25*x^-1 = -4.54545455 // : -25
x^-1 = 0.18181818
-1 < 0
1/(x^1) = 0.18181818 // * x^1
1 = 0.18181818*x^1 // : 0.18181818
5.50000006 = x^1
x = 5.50000006
x = 5.50000006
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