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d in (-oo:+oo)
6*d-8 = 5-7*d // - 5-7*d
6*d-(-7*d)-8-5 = 0
6*d+7*d-8-5 = 0
13*d-13 = 0 // + 13
13*d = 13 // : 13
d = 13/13
d = 1
d = 1
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