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x in (-oo:+oo)
18*x^2-((1/2)*x^3) = 0
(-1/2)*x^3+18*x^2 = 0
18*x^2-1/2*x^3 = 0
x^2*(18-1/2*x) = 0
18-1/2*x = 0 // - 18
-1/2*x = -18 // : -1/2
x = -18/(-1/2)
x = 36
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 36, 0 }
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