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d in (-oo:+oo)
(d/640)*(d+20/160) = 0
1/640*d*(d+1/8) = 0
( 1/640*d )
1/640*d = 0 // : 1/640
d = 0
( d+1/8 )
d+1/8 = 0 // - 1/8
d = -1/8
d in { 0, -1/8 }
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