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D( x )
(5*x-9)^9 = 0
(5*x-9)^10 = 0
(5*x-9)^9 = 0
(5*x-9)^9 = 0
5*x-9 = 0 // + 9
5*x = 9 // : 5
x = 9/5
(5*x-9)^10 = 0
(5*x-9)^10 = 0
5*x-9 = 0 // + 9
5*x = 9 // : 5
x = 9/5
x in (-oo:9/5) U (9/5:+oo)
1/((5*x-9)^9)-((45*x)/((5*x-9)^10)) = 0
1/((5*x-9)^9)-45*x*(5*x-9)^-10 = 0
1/((5*x-9)^9)+(-45*x)/((5*x-9)^10) = 0
(1*(5*x-9))/((5*x-9)^10)+(-45*x)/((5*x-9)^10) = 0
1*(5*x-9)-45*x = 0
-40*x-9 = 0
(-40*x-9)/((5*x-9)^10) = 0
(-40*x-9)/((5*x-9)^10) = 0 // * (5*x-9)^10
-40*x-9 = 0
-40*x-9 = 0 // + 9
-40*x = 9 // : -40
x = 9/(-40)
x = -9/40
x = -9/40
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