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