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x in (-oo:+oo)
27*x^4-(x^2*((18*x^3)/3)) = 0
27*x^4-6*x^5 = 0
27*x^4-6*x^5 = 0
3*x^4*(9-2*x) = 0
9-2*x = 0 // - 9
-2*x = -9 // : -2
x = -9/(-2)
x = 9/2
3*x^4 = 0
3*x^4 = 0 // : 3
x^4 = 0
x = 0
x in { 9/2, 0 }
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