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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 8/50 // - 8/50
2/x-(8/50) = 0
2/x-4/25 = 0
2*x^-1 = 4/25 // : 2
x^-1 = 2/25
-1 < 0
1/(x^1) = 2/25 // * x^1
1 = 2/25*x^1 // : 2/25
25/2 = x^1
x = 25/2
x = 25/2
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