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D( x )
4.5*x = 0
4.5*x = 0
4.5*x = 0
4.5*x = 0 // : 4.5
x = 0
x in (-oo:0) U (0:+oo)
(6*39)/(4.5*x) = 5.5 // - 5.5
(6*39)/(4.5*x)-5.5 = 0
52*x^-1 = 5.5 // : 52
x^-1 = 0.10576923
-1 < 0
1/(x^1) = 0.10576923 // * x^1
1 = 0.10576923*x^1 // : 0.10576923
9.45454552 = x^1
x = 9.45454552
x = 9.45454552
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