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y in (-oo:+oo)
(y*(140-(2*y)))/2 = 0
(y*(140-2*y))/2 = 0
( 140-2*y )
140-2*y = 0 // - 140
-2*y = -140 // : -2
y = -140/(-2)
y = 70
( y )
y = 0
y in { 70, 0 }
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