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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x*((5*(x-3))/2))/(x^2)-(9/x) = 0
(x*((5*(x-3))/2))/(x^2)-9*x^-1 = 0
(5*x*(x-3))/(2*x^2)-9/x = 0
(5*x^2*(x-3))/(2*x*x^2)+(-9*2*x^2)/(2*x*x^2) = 0
5*x^2*(x-3)-9*2*x^2 = 0
5*x^3-33*x^2 = 0
5*x^3-33*x^2 = 0
x^2*(5*x-33) = 0
5*x-33 = 0 // + 33
5*x = 33 // : 5
x = 33/5
x^2*(x-33/5) = 0
(x^2*(x-33/5))/(2*x*x^2) = 0
(x^2*(x-33/5))/(2*x*x^2) = 0 // * 2*x*x^2
x^2*(x-33/5) = 0
( x-33/5 )
x-33/5 = 0 // + 33/5
x = 33/5
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0}
x = 33/5
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