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X in (-oo:+oo)
X*((400*X-8000)/400) = 0
(X*(400*X-8000))/400 = 0
( 400*X-8000 )
400*X-8000 = 0 // + 8000
400*X = 8000 // : 400
X = 8000/400
X = 20
( X )
X = 0
X in { 20, 0 }
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