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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 20 // - 20
2/x-20 = 0
2*x^-1 = 20 // : 2
x^-1 = 10
-1 < 0
1/(x^1) = 10 // * x^1
1 = 10*x^1 // : 10
1/10 = x^1
x = 1/10
x = 1/10
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