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d in (-oo:+oo)
97 = 5*d+3*d+1 // - 5*d+3*d+1
97-(5*d)-(3*d)-1 = 0
97-5*d-3*d-1 = 0
96-8*d = 0 // - 96
-8*d = -96 // : -8
d = -96/(-8)
d = 12
d = 12
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