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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 12.5/10 // - 12.5/10
5/x-(12.5/10) = 0
5/x-1.25 = 0
5*x^-1 = 1.25 // : 5
x^-1 = 0.25
-1 < 0
1/(x^1) = 0.25 // * x^1
1 = 0.25*x^1 // : 0.25
4 = x^1
x = 4
x = 4
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