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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25/x = 2.5/4 // - 2.5/4
25/x-(2.5/4) = 0
25/x-0.625 = 0
25*x^-1 = 0.625 // : 25
x^-1 = 0.025
-1 < 0
1/(x^1) = 0.025 // * x^1
1 = 0.025*x^1 // : 0.025
40 = x^1
x = 40
x = 40
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