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d in (-oo:+oo)
(5/7)*d+5 = 95/21 // - 95/21
(5/7)*d-(95/21)+5 = 0
(5/7)*d-95/21+5 = 0
5/7*d+10/21 = 0 // - 10/21
5/7*d = -10/21 // : 5/7
d = -10/21/5/7
d = -2/3
d = -2/3
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