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d in (-oo:+oo)
(4/7)*d+3 = 25/7 // - 25/7
(4/7)*d-(25/7)+3 = 0
(4/7)*d-25/7+3 = 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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