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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x = 4.5/1 // - 4.5/1
18/x-(4.5/1) = 0
18/x-4.5 = 0
18*x^-1 = 4.5 // : 18
x^-1 = 0.25
-1 < 0
1/(x^1) = 0.25 // * x^1
1 = 0.25*x^1 // : 0.25
4 = x^1
x = 4
x = 4
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