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x in (-oo:+oo)
(3.33*x^3*(12-(0.2*x)))/2 = 0
(3.33*x^3*(12-0.2*x))/2 = 0
( 12-0.2*x )
12-0.2*x = 0 // - 12
-0.2*x = -12 // : -0.2
x = -12/(-0.2)
x = 60
( 3.33*x^3 )
3.33*x^3 = 0 // : 3.33
x^3 = 0
x = 0
x in { 60, 0 }
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