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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9/x-6)*(x^2-((36/11)*x)) = 0
(9/x-6)*(x^2+(-36/11)*x) = 0
(9*x^-1-6)*(x^2-36/11*x) = 0
x^2-36/11*x = 0
x*(x-36/11) = 0
x-36/11 = 0 // + 36/11
x = 36/11
x*(x-36/11) = 0
x*(9*x^-1-6)*(x-36/11) = 0
( 9*x^-1-6 )
9*x^-1 = 6 // : 9
x^-1 = 2/3
-1 < 0
1/(x^1) = 2/3 // * x^1
1 = 2/3*x^1 // : 2/3
3/2 = x^1
x = 3/2
( x-36/11 )
x-36/11 = 0 // + 36/11
x = 36/11
( x )
x = 0
x in { 0}
x in { 3/2, 36/11 }
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