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d in (-oo:+oo)
9-(2*d) = 33 // - 33
9-(2*d)-33 = 0
9-2*d-33 = 0
-2*d-24 = 0 // + 24
-2*d = 24 // : -2
d = 24/(-2)
d = -12
d = -12
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