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y in (-oo:+oo)
(1/2)*y*(6-y) = 0
1/2*y*(6-y) = 0
( 1/2*y )
1/2*y = 0 // : 1/2
y = 0
( 6-y )
6-y = 0 // - 6
-y = -6 // * -1
y = 6
y in { 0, 6 }
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