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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20/x = 4 // - 4
20/x-4 = 0
20*x^-1 = 4 // : 20
x^-1 = 1/5
-1 < 0
1/(x^1) = 1/5 // * x^1
1 = 1/5*x^1 // : 1/5
5 = x^1
x = 5
x = 5
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