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d in (-oo:+oo)
(6/7)*d+1/8 = 439/56 // - 439/56
(6/7)*d+1/8-(439/56) = 0
(6/7)*d+1/8-439/56 = 0
6/7*d-54/7 = 0 // + 54/7
6/7*d = 54/7 // : 6/7
d = 54/7/6/7
d = 9
d = 9
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