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d in (-oo:+oo)
(1/7)*d+1/2 = 47/84 // - 47/84
(1/7)*d+1/2-(47/84) = 0
(1/7)*d+1/2-47/84 = 0
1/7*d-5/84 = 0 // + 5/84
1/7*d = 5/84 // : 1/7
d = 5/84/1/7
d = 5/12
d = 5/12
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