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