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d in (-oo:+oo)
-(4*d)-9 = -33 // + 33
33-(4*d)-9 = 0
33-4*d-9 = 0
24-4*d = 0 // - 24
-4*d = -24 // : -4
d = -24/(-4)
d = 6
d = 6
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