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d in (-oo:+oo)
(5/12)*d+(1/3)*d+(1/12)*d+1/6 = 6 // - 6
(5/12)*d+(1/3)*d+(1/12)*d+1/6-6 = 0
5/6*d-35/6 = 0 // + 35/6
5/6*d = 35/6 // : 5/6
d = 35/6/5/6
d = 7
d = 7
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