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x in (-oo:+oo)
x*((3*(16-x))/2) = 0
(3*x*(16-x))/2 = 0
( 16-x )
16-x = 0 // - 16
-x = -16 // * -1
x = 16
( 3 )
3 = 0
x belongs to the empty set
( x )
x = 0
x in { 16, 0 }
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