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d in (-oo:+oo)
(4/7)*d-4/7 = 40/7 // - 40/7
(4/7)*d-4/7-(40/7) = 0
(4/7)*d-4/7-40/7 = 0
4/7*d-44/7 = 0 // + 44/7
4/7*d = 44/7 // : 4/7
d = 44/7/4/7
d = 11
d = 11
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