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x in (-oo:+oo)
x*((11*x^2-90000)/3) = 0
(x*(11*x^2-90000))/3 = 0
( 11*x^2-90000 )
11*x^2 = 90000 // : 11
x^2 = 90000/11
x^2 = 90000/11 // ^ 1/2
abs(x) = (90000/11)^(1/2)
x = (90000/11)^(1/2) or x = -(90000/11)^(1/2)
( x )
x = 0
x in { (90000/11)^(1/2), -(90000/11)^(1/2), 0 }
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