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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20/x = 4/9 // - 4/9
20/x-(4/9) = 0
20/x-4/9 = 0
20*x^-1 = 4/9 // : 20
x^-1 = 1/45
-1 < 0
1/(x^1) = 1/45 // * x^1
1 = 1/45*x^1 // : 1/45
45 = x^1
x = 45
x = 45
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