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d in (-oo:+oo)
-(2*d)-1 = -25 // + 25
25-(2*d)-1 = 0
25-2*d-1 = 0
24-2*d = 0 // - 24
-2*d = -24 // : -2
d = -24/(-2)
d = 12
d = 12
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