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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20/x = 100/0.4 // - 100/0.4
20/x-(100/0.4) = 0
20/x-250 = 0
20*x^-1 = 250 // : 20
x^-1 = 25/2
-1 < 0
1/(x^1) = 25/2 // * x^1
1 = 25/2*x^1 // : 25/2
2/25 = x^1
x = 2/25
x = 2/25
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