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d in (-oo:+oo)
((d-25)/2)*(d-25-3) = 0
((d-25)*(d-28))/2 = 0
( d-25 )
d-25 = 0 // + 25
d = 25
( d-28 )
d-28 = 0 // + 28
d = 28
d in { 25, 28 }
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