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d in (-oo:+oo)
(-5/8)*(2*d-1) = 15 // - 15
(-5/8)*(2*d-1)-15 = 0
-5/8*(2*d-1)-15 = 0
-5/8*(2*d-1)-15 = 0
-5/4*d-115/8 = 0
-5/4*d-115/8 = 0
-5/4*d-115/8 = 0 // + 115/8
-5/4*d = 115/8 // : -5/4
d = 115/8/(-5/4)
d = -23/2
d = -23/2
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