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d in (-oo:+oo)
-(6*d)-4 = -8 // + 8
8-(6*d)-4 = 0
8-6*d-4 = 0
4-6*d = 0 // - 4
-6*d = -4 // : -6
d = -4/(-6)
d = 2/3
d = 2/3
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