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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 40/90 // - 40/90
5/x-(40/90) = 0
5/x-4/9 = 0
5*x^-1 = 4/9 // : 5
x^-1 = 4/45
-1 < 0
1/(x^1) = 4/45 // * x^1
1 = 4/45*x^1 // : 4/45
45/4 = x^1
x = 45/4
x = 45/4
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