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d in (-oo:+oo)
9-(3*d) = 45-6*d // - 45-6*d
9-(3*d)-(-6*d)-45 = 0
6*d-3*d-45+9 = 0
3*d-36 = 0 // + 36
3*d = 36 // : 3
d = 36/3
d = 12
d = 12
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