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d in (-oo:+oo)
-89 = 4*d+6*d-9 // - 4*d+6*d-9
9-(4*d)-(6*d)-89 = 0
9-4*d-6*d-89 = 0
-10*d-80 = 0 // + 80
-10*d = 80 // : -10
d = 80/(-10)
d = -8
d = -8
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