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d in (-oo:+oo)
1-((1/6)*d) = 47/6-7*d // - 47/6-7*d
1-((1/6)*d)-(-7*d)-(47/6) = 0
(-1/6)*d+7*d-47/6+1 = 0
41/6*d-41/6 = 0 // + 41/6
41/6*d = 41/6 // : 41/6
d = 41/6/41/6
d = 1
d = 1
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