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d in (-oo:+oo)
68 = 6*d+5*d-9 // - 6*d+5*d-9
9-(6*d)-(5*d)+68 = 0
9-6*d-5*d+68 = 0
77-11*d = 0 // - 77
-11*d = -77 // : -11
d = -77/(-11)
d = 7
d = 7
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