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d in (-oo:+oo)
(5/6)*d-1/2 = 7 // - 7
(5/6)*d-1/2-7 = 0
5/6*d-15/2 = 0 // + 15/2
5/6*d = 15/2 // : 5/6
d = 15/2/5/6
d = 9
d = 9
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