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x in (-oo:+oo)
8*x^4-(x^2*((6*x^3)/2)) = 0
8*x^4-3*x^5 = 0
8*x^4-3*x^5 = 0
x^4*(8-3*x) = 0
8-3*x = 0 // - 8
-3*x = -8 // : -3
x = -8/(-3)
x = 8/3
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in { 8/3, 0 }
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