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d in (-oo:+oo)
(4/7)*d+5/8 = 3/56 // - 3/56
(4/7)*d+5/8-(3/56) = 0
(4/7)*d+5/8-3/56 = 0
4/7*d+4/7 = 0 // - 4/7
4/7*d = -4/7 // : 4/7
d = -4/7/4/7
d = -1
d = -1
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