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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.25/x = 20 // - 20
2.25/x-20 = 0
2.25*x^-1 = 20 // : 2.25
x^-1 = 8.88888889
-1 < 0
1/(x^1) = 8.88888889 // * x^1
1 = 8.88888889*x^1 // : 8.88888889
0.1125 = x^1
x = 0.1125
x = 0.1125
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