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