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x in (-oo:+oo)
(3*x^2)/11-((x^3)/11) = 0
3/11*x^2-1/11*x^3 = 0
1/11*x^2*(3-x) = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
(x^2)/11 = 0
1/11*x^2 = 0 // : 1/11
x^2 = 0
x = 0
x in { 3, 0 }
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