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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/2.5 = 25/x // - 25/x
2/2.5-(25/x) = 0
2/2.5-25*x^-1 = 0
-25*x^-1 = -0.8 // : -25
x^-1 = 0.032
-1 < 0
1/(x^1) = 0.032 // * x^1
1 = 0.032*x^1 // : 0.032
31.25 = x^1
x = 31.25
x = 31.25
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