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d in (-oo:+oo)
7*d-9 = -115/12 // + -115/12
7*d-(-115/12)-9 = 0
7*d+115/12-9 = 0
7*d+7/12 = 0 // - 7/12
7*d = -7/12 // : 7
d = -7/12/7
d = -1/12
d = -1/12
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