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d in (-oo:+oo)
2*(-4*d-3) = -86 // + 86
2*(-4*d-3)+86 = 0
2*(-4*d-3)+86 = 0
80-8*d = 0
80-8*d = 0
80-8*d = 0 // - 80
-8*d = -80 // : -8
d = -80/(-8)
d = 10
d = 10
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