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d in (-oo:+oo)
45 = 2*d+2*d+1 // - 2*d+2*d+1
45-(2*d)-(2*d)-1 = 0
45-2*d-2*d-1 = 0
44-4*d = 0 // - 44
-4*d = -44 // : -4
d = -44/(-4)
d = 11
d = 11
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