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d in (-oo:+oo)
(2/7)*d+4 = 143/7-3*d // - 143/7-3*d
(2/7)*d-(-3*d)-(143/7)+4 = 0
(2/7)*d+3*d-143/7+4 = 0
23/7*d-115/7 = 0 // + 115/7
23/7*d = 115/7 // : 23/7
d = 115/7/23/7
d = 5
d = 5
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