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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
17/x = 4.5/1 // - 4.5/1
17/x-(4.5/1) = 0
17/x-4.5 = 0
17*x^-1 = 4.5 // : 17
x^-1 = 0.26470588
-1 < 0
1/(x^1) = 0.26470588 // * x^1
1 = 0.26470588*x^1 // : 0.26470588
3.77777781 = x^1
x = 3.77777781
x = 3.77777781
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