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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50/x = 2/5 // - 2/5
50/x-(2/5) = 0
50/x-2/5 = 0
50*x^-1 = 2/5 // : 50
x^-1 = 1/125
-1 < 0
1/(x^1) = 1/125 // * x^1
1 = 1/125*x^1 // : 1/125
125 = x^1
x = 125
x = 125
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