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d in (-oo:+oo)
3*d-(6*d)-8 = -44 // + 44
3*d-(6*d)-8+44 = 0
3*d-6*d-8+44 = 0
36-3*d = 0 // - 36
-3*d = -36 // : -3
d = -36/(-3)
d = 12
d = 12
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