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d in (-oo:+oo)
5-3*d = 6*d-67 // - 6*d-67
5-3*d-(6*d)+67 = 0
5-3*d-6*d+67 = 0
72-9*d = 0 // - 72
-9*d = -72 // : -9
d = -72/(-9)
d = 8
d = 8
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