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