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D( x )
(2*x^3)/9-x^2 = 0
(2*x^3)/9-x^2 = 0
(2*x^3)/9-x^2 = 0
2/9*x^3-x^2 = 0
x^2*(2/9*x-1) = 0
2/9*x-1 = 0 // + 1
2/9*x = 1 // : 2/9
x = 1/2/9
x = 9/2
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:9/2) U (9/2:+oo)
((3*x)/15-(5*x))/((2*x^3)/9-x^2) = 0
((3*x)/15-5*x)/((2*x^3)/9-x^2) = 0
(-24/5*x)/(2/9*x^3-x^2) = 0
2/9*x^3-x^2 = 0
x^2*(2/9*x-1) = 0
2/9*x-1 = 0 // + 1
2/9*x = 1 // : 2/9
x = 1/2/9
x = 9/2
x^2*(x-9/2) = 0
(-24/5*x)/(x^2*(x-9/2)) = 0
-24/5*x = 0 // : -24/5
x = 0
x in { 0}
x belongs to the empty set
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