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x in (-oo:+oo)
x*x^2*((100-(8*x^2))/12) = 0
x*x^2*((100-8*x^2)/12) = 0
(x^3*(100-8*x^2))/12 = 0
( 100-8*x^2 )
-8*x^2 = -100 // : -8
x^2 = 25/2
x^2 = 25/2 // ^ 1/2
abs(x) = (25/2)^(1/2)
x = (25/2)^(1/2) or x = -(25/2)^(1/2)
( x^3 )
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { (25/2)^(1/2), -(25/2)^(1/2), 0 }
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