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d in (-oo:+oo)
(4/7)*d+1 = 43/7 // - 43/7
(4/7)*d-(43/7)+1 = 0
(4/7)*d-43/7+1 = 0
4/7*d-36/7 = 0 // + 36/7
4/7*d = 36/7 // : 4/7
d = 36/7/4/7
d = 9
d = 9
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