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d in (-oo:+oo)
(3/7)*d+5 = 20/7 // - 20/7
(3/7)*d-(20/7)+5 = 0
(3/7)*d-20/7+5 = 0
3/7*d+15/7 = 0 // - 15/7
3/7*d = -15/7 // : 3/7
d = -15/7/3/7
d = -5
d = -5
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