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d in (-oo:+oo)
d*((8*d-2)/2) = 0
(d*(8*d-2))/2 = 0
( 8*d-2 )
8*d-2 = 0 // + 2
8*d = 2 // : 8
d = 2/8
d = 1/4
( d )
d = 0
d in { 1/4, 0 }
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