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x in (-oo:+oo)
18*x^4-(x^2*((6*x^3)/3)) = 0
18*x^4-2*x^5 = 0
18*x^4-2*x^5 = 0
2*x^4*(9-x) = 0
9-x = 0 // - 9
-x = -9 // * -1
x = 9
2*x^4 = 0
2*x^4 = 0 // : 2
x^4 = 0
x = 0
x in { 9, 0 }
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